"I have both the Umarex competition series Tavor and the Elite Force Tavor and I personally think this is definitely worth the money.
The main advantages over the competition series Tavor is the higher density polymer body (more sturdy and feels nice), the internals (the gears are reinforced and can handle more stress than the gears on the competition series). The best thing about this platform I think though, is that it is a version 2 gearbox and accepts M4 mags. The parts that are likely to break work with M4 parts, I've replaced gears, the cylinder, piston, and head on this and the gun works fine. The only thing I have had issue with is finding a hop up unit for it and I've heard that the nozzle is unique on the tavor. However, there is another nozzle sold for the Tavor and the hop-up unit is very unlikely to break. The gun is very friendly to experiment with considering it has a QC spring and the barrel is fairly easily to get to. Be careful not to overtighten screws though, especially on the gearbox.
I've used an 11.1V lipo in this for a while and put a considerable amount of stress on it, the first thing that broke was the piston teeth (I had a pretty tough spring in it). For whatever reason full steel teeth haven't worked well for me (perhaps due to poor lubrication) and so I've had better luck sticking to a polycarbonate piston, and one with a steel tooth on the last tooth, but a plastic catch tooth (the tooth for the first contact). The next thing that broke was the trigger contacts. This problem will likely not occur with lower voltage batteries. This problem can be avoided with a MOSFET, and you don't need a fancy one.
I got the F1 Jack HPA conversion kit for this gun and it works beautifully, so if you're ever considering going the HPA route, this gun will allow that. Just be ready to cut up the gun body for an air line.
Only con here is the iron sights, they sit low, so you may be better off getting a riser and a sight if you have bulky goggles.
"For fans of the Tavor (and IMI/IWI in general), this is the holy grail of replicas.
+Very balanced for a bullpup.
+EBB is nice and crisp even after a year plus of use.
+EBB is easy to disable if you want to be sneaky.
+Takes STANAG magazines.
+Quick change spring system is a blessing, very easy and it enables you to switch from CQB range to Woodland within minutes.
+It's a TAR-21 and not just another M4.
+100% fieldable out of the box; solid ROF and FPS.
-You get very limited rail space.
-The iron sights suck out loud.
-Limited aftermarket base for both internal and external parts.
-EBB is pretty dang loud, although it is easy to disable (see above)
-The pin in the back to access the GB is very loose, I recommend investing in some gaffer's tape.
-14mm Positive threads means you will need an adapter for 98% of flash hiders/mock suppressors
"Pro/Con List Up Top
It's a Tavor
Tough polymer construction
Easy access battery compartment
Locking bolt makes adjusting your hop-up a breeze
Spring detention switch on the bottom of the butt (veteran airsofters have commented that they love that feature)
It's a Tavor
Accepts M4 mags.
Did I mention it's a Tavor?
360-395 FPS after a year of use.
EBB (some see it as a Pro. Easily disabled, though!)
Tiny iron sight picture
Rail space (not a problem for me, but it's something to consider)
Longish trigger pull (the nature of the beast when it comes to all bullpups)
No stock battery (you'll buy a higher quality one anyway)
No charger (you'll want a smart charger).
And now, the rest of the story...
I'll open by saying I love my Tavor. "Emma" was my first purchase last year and I've never looked back. Only misfired once a month ago when I was using a high-cap to zero my sight, and I'm pretty sure that was user error (sorry Emma! No more high-caps for us). I use G&P High RPS Skullfrog M4 mags, and they feed beautifully.
The polymer body is strong and has a rugged feel. Full authentic trademarks from Israel Weapon Industries. There's a bit of extra material from when the manufacturers popped it out of the mold, but you can sand that down (GENTLY!) if it bothers you. I like Emma just the way she is. If you have the know-how, or know someone that has the know-how, you can switch the bolt catch, rail, fire-selector switch, and dust cover to either side of the rifle, so you can fire left handed. The trigger pull is somewhat long, but that's what you get with bullpups.
She may not have a lot of rail space, but there's a comfortable place to set your hand at the battery compartment up front. I've toyed with the idea of getting the Angry Gun rail set. I don't think it's necessary. One rail will be plenty once I've decided on getting a light or a laser. If you have zoom optics, though, you'll want to get the full top rail, because the optic will sit too far from your eye. Your sight picture will be about the size of a penny. Speaking of small sight pictures, the pinhole that is your iron sights is tough to see through, so you'll want to get an RDS when you get the chance. Hey, nobody's perfect!
Yes, there's an electronic blow-back "feature." No, it's not going to throw off your shot. It kicks less than a .22. Yes, it's a LITTLE noisy, so if you're into sound discipline, enemies that are right on top of you will know you're there. No, it's not going to deafen you. Thunder B's are more likely to do that. Yes, it DOES put a little extra pressure on your internals, but disabling it is as easy as pulling the bolt catch. This leaves your dust cover open, so it's up to you if you want to do that. I found this out a couple months ago, so the EBB was on for a while, and still no problems. Come to think of it, I've played on semi-auto only fields, so I've not tried her in full auto. In that case, I'd definitely want to disable the EBB.
Sling points! That small circle at the butt of the rifle is a QD sling mount slot, so you can run one of those through it and attach a single-point sling. If you're fancy, you can get a rail-mounted sling mount and put that up front for a two-point sling. If you're a VIP at a 5-Star Restaurant on a Cruise Ship fancy, you can get a sling strap and fit it in the middle of the rifle just behind the rear sight.
If you're an M4 monkey, using the TAR may take some getting used to. You'll love having all that extra barrel length without having a long rifle. I spoke with my local airsoft tech store and they said the internals are mostly interchangeable if you want to upgrade the thing.