Fwiw, I've been using a Tsar for Ft for around 2 years. There is another being used in our club, as well. The power plant is very well made. The stock... somewhat crude compared to FWB or Anschutz , but still very functional. Main problem for me is getting the scope far enough forward. I have reach forward mounts and my butt adjustment pretty much all the way out. It's fine from the bench.
Having been inside a huge number of ag's, I consider this one extremely strong and well made.... much more so than an FWB 800. My regulator has been impeccable but the other person had trouble with his... not sure what. It seems well designed and assembled to me. Trigger is as good as any match rifle I've shot. Balance is ok but I like my AA RN10 better.
Ok...so I think it's well made and nice to shoot but we HAVE had some negatives. 12 ft lb models are reputed to shoot VERY well but ours are 20 ft lb models. Velocity consistency has been extremely good but the factory barrels just didn't do well. I worked on my own but never got it good enough to suit me so fitted a couple of LW polygon's I had on hand and they have been stellar. A third Tsar in our group says his is fine but he has not used it in comp yet. The last thing and main issue I've had is the inefficiency. Mine can barely make a 40 shot match from a 220 bar fill. The other gentleman's SOUNDS different and he can get 70 shots from his. I don't know what the difference is yet. Mine for sure is wasting a lot of air. The problem on it is that the configuration of the hammer system only allows for preload and the hammer spring is long and unsupported. There is no way to adjust stroke. Not sure how the 12 ft lb models are configured but I've installed the lightest spring that supports itself and turned the reg down and even built a hammer spring guide, as much as it allows, and still wasting a lot of air at 19 ft lb.
I just re-read and realized that you were probably asking in reference to the 22 cal. No experience with that one but still feel these are quite strong and well made vs the 800. Anyway , that's my experience so far.
Bob