||I've had this for about a year and a half. Did a few modifications and added a TBB barrel, Daniel Defense rail, mock suppressor, and Magpul furniture. This thing is compatible with my AR15 accessories which was really convenient.
-Awesome range (effective of about 60-65 meters)
-Durable (internals are top notch, no replacements so far!)
-Easily customized compared to AEG's because of the real steel compatibility
-Blowback with bolt stop is a nice thing to have, which is standard on GBBRs
-Cost of maintenance and use (Gas, magazine valves)
-Magazines are very expensive and 32rds isn't very practical for airsoft
-Loud (impractical for airsoft)
-Magazines are heavy, you need a VERY high quality plate carrier and quality pouches
Overall: It's a fun gun, but be ready for high maintenance, a lot of money along the way, and you're gonna need to be a handy guy/gal to keep the gun and its magazines working properly. I enjoy that part though, because to me working on firearms is fun and this is good practice; along with the simulated recoil and 32rd mags.
I grew tired of this in airsoft, though. I was easily out gunned at times because of people with Hi-caps or midcaps higher than my mags, so I found myself suppressed easily, and I always feel bad asking for cover fire. It's very hard to suppress and shooting on full auto will just empty your mag's gas chamber like no other. Gas is also very inconsistent, making it hard to predict the bb's flight path past 150 feet or so.
Because of these issues, I've decided to sell this gun and all the mags (12), and use the money for a sniper platform.
Now that I have experience with this, I realized it wasn't for me. You might as well make it a DMR because there's just too many disadvantages going against 30rps AEG's or Polarstars with 200+ rounds in a mag. ***BE WARNED*** Having a GBBR is only for those who are very experienced and looking for a challenge.
Rating: [4 of 5 Stars!]