I would rank the 60-90 Class ARF Extras like this: (I have owned or flown each... there are others, but I have no experience with them)..

1) Kangke Extra with Saito 100 (nice build, easy, good fitting pieces, etc... Cowling and wheel pants a little cheesy).
2) Yellow Aircraft Extra with Saito 100 (awesome flying machine, light, beautiful.. the Kangke flew better... expensive)
3) Vector Flight Extra with Saito 91 (awesome flyer, tough to build... cheesy plastic parts)
4) Seagull Extra with a tiger shark 75 (POS) covering was coming off as I was building it, didn't fly well, my wing might have warped.. just tossed it in the trash.
5) Graupner Extra with a Magnum 91 (supreme POS) weak landing gear (grass field was a no go), firewall needed a rebuild before mounting the engine... covering material, and cowling didn't match... Flew like a brick... It would have been a good pylon racer, but not scale aerobatics..