We have two 64GB models. One in the living room and I just bought my son one for his bedroom for Christmas. I believe I've had the one in my living room for over a year now, has it been out that long? I think I got if for Christmas last year iirc.
Anyways, we love them. My 8 year old son finally got so tired of his 3rd gen Apply TV in his room he asked for a 4th gen for Christmas. He also has the nice gaming controller sold at the Apple Store with a lighting port charger.
I like the 4th gen simply because it's so much faster and easier to navigate than the old one. The voice recognition works great as well. The games are fun and are actually somewhat comparable to real console games in graphics. Mostly we use it for arcade style "pick up and play for fun" games. Not COD type games. However my son did just download the new Minecraft and is very impressed with it. He said it is very comparable to the PC version. Way better than his iPad version.
I use it every day for YouTube which works way better than the 3rd gen Apple TV. I can't figure out how to "LIKE" a video though. But all my subscriptions are easy to navigate. It does a great job of recommending videos it thinks I would like to watch.
We still do currently have two 3rd gen Apple TV's hooked up in our house but I plan to replace those soon with new ones.
Overall, for the cost, I'd highly recommend the new 4th gen Apple TV. IMO they have always been a bargain even at the new price points.