Well,

If you want the "Extreme Flight" YAK, if you check the forum you will see at least one thread on elevator flutter resulting in loss of horizantal stab and a crash with that one.

To me the bottom line is proper setup (good servo's with correct leverage on the horns) and no slop in the linkages, and paying attention to the hinge gap etc.

Any of these type planes can get a case of the "flutters" due to the above, or what I often see at our field, over powered and over-flown (too fast). When the Sukhoi's first came out all seemed to have flimsy cracked cowls and some other problems. 2nd batch straightened those issues as I recall.

I am sticking with Somenzini's YAK. By the time I would get composite gear for the Sukhoi its at or above the price of the YAK.