"The Good: After adjusting it correctly, it does it's job "perfectly". It lasts many hours of straight gameplay, and takes either 3 or 4 AAA batteries. I will go on record to say that this fan, with or without the Revision Anti-Fog, is absolutely the ONLY thing to ever work for me. Most Sprays/Wipes/DIY methods will help deter fog only 10 minutes longer than without it at all, for me. I sweat A LOT, whether it's 30F outside or 90F outside. The Wipes worked the best for me, however instead of Fog it goes straight to WaterWall. Either way I'm essentially blind. The Fan however, keeps the visor both Dry and 100% the same temperature as the outside air... thus preventing Fog/Condensation buildup. It's pretty quiet too, but it's unlikely you'll hear footsteps if someone is trying to sneak up on you. I can still hear bbs rattling, gun parts, branches snapping, etc with the fan on though. I just can't hear people who sneak very quietly with the fan on... with it off I can hear them. I think most of the "noise" is actually vibration though, jumping around through my helmet. I can't actually hear the fan itself. So it could be my helmet's plastic shell is too thin and... well... that's my fault.
The Bad: No Velcro patches come with the power supply part, but it does come standard with the actual Fan.
The Ugly: So, there are some Tricks you have to perform if you want it to function as expected/desired. You can't just shove it anywhere into your helmet or goggles, for starters. The best setup I've found, is mounting the battery compartment on the back right or back left side of a FAST type Tac Helmet, then mounting the Fan on the Middle Right or Middle Left side. Then take the rubber tube, and run it into your goggles. The smartest thing to do, is measure how much hose you actually need, with half an inch to spare, and cut the rest off. SAVE IT just in case you need to reattach it. Loctite+Gorilla Tape will ensure it stays on there and with no leak if you do reattach it. Now what matters, is where the end of that hose is pointing and sitting in the goggles. I took one of the vents in the top right of my goggles(aligning the pack/fan/tube all to the rightside for me) and made it wide enough to have a snug hold on the tube, but not pinch it or reduce airsflow. I shoved the tube in, and with the way it wrapped around my helmets front edge and the direction it came from, it pointed directly at the lens forcing all of the air to slightly right of the middle of the lens. It stays 100% dry at all times, no matter how much I sweat. I can have a small shallow puddle of sweat in my goggles, and they'll otherwise stay 100% clear.
Overall: I don't regret buying this one bit. It does it's job very well. Yes, it does take a smidgen of tinkering, but if you refuse to tinker or just can't, you probably shouldn't be playing Airsoft. Everything requires some finesse at some point.
If you don't mount it right, it won't work to it's maximum efficiency. When you do mount it right, it's pretty amazing.
"Wow! This is an amazing product and a must have for any hardcore airsofter in need of an affordable yet outstanding goggle fan! To start off ill begin by telling you how I mounted it and then go from there. So basically the only way to mount this the easiest is to have it placed on a helmet. I don't really see any other way it could be mounted. I was able to attach the velcro it came with to the back of my helmet for the battery pack and then the actual fan to the side of the helmet, and then run the straw into my Arena FlakJak's. The straw can get in your way of vision so I recommend cutting it but don't cut it to much because you still want it to run well into the goggle, just out of your line of sight. I haven't actually used this in full combat yet but i used it in some training exercises with all my gear on and I was blown away!(no pun intended) I sweat a lot with my helmet, goggles, and face mask on and even though i was still sweating, there was absolute 0% fogging! I'm more than impressed with this fan so bottom line, get it guys its worth the price you pay by far!