I have the older Gen 1 Yak, I think at $600 it will be a steal! I have no complaints as of the finish of the airplane, fit on the canopy could be a little better(canopy blew off, but with a little aligning of the brass tubes it now fits well), and the bevels could be a little more on the elevator (Plenty for all 3d, doesn't take much but it takes a little work to get into a KE spin; still it's perfectly doable), but it's nothing that could be fixed easily. I think the canopy was just an isolated case and nothing more, we fixed the alignment very quickly; elevator bevels can be sanded a little and covering re-applied if you really wanted to. It would be a little bit of work to do it, but it wouldn't be that hard. (if you even need to, but I think mine is fine the way it is) Again, it might vary from plane to plane how much work you might have to do. The newer generation probably flies exactly like the older one, just some changes in construction, so if you can get it, I'd say it's probably worth it.
Regardless, it's still a QQ Yak and it flys AWESOME, very little bad habits.
I have a video on the video contest page if you want to check it out.
Brandon