Just flew a Yak 54 for the first time today, supposedly the only one in the US (N154DB). Lots of fun! Easy to fly though a bit squirrelly until you get then hang of it (so I'm told - I did not get the hang of it in our one hour flight!) Did a bunch of acros, nothing fancy, just the usual +G stuff. It will snap at the drop of a hat (tiny bit of back stick during a roll for example), but the handling is benign. I didn't do the landing so I can't comment on that. Apparently the glide ratio is worse than the Pitts, which is hard to believe, but it didn't seem as dramatic as the Pitts.