RE: What do you think of the Avistar
Its not the best airplane in the world. (there is no such thing)
It is a very good ARF trainer and introductory aerobatic model. the Monokote version (I think they stopped selling the shelf paper covered version...) is strong, reasonably light and they tend to be well made. ( a lot better than some other ARFs...)
Don't expect 3D performance... it isn't made for it.