I am still a very new student R/C flyer BUT...I have 3 working trainers.

I travel allot and have them staged in areas where I may be able to bum a lesson occasionally. This rain HAS NOT HELPED. My favorite of the 3 is the Kyosho Calmato. It has semi symmetrical wings and a very slight and gradual dihedral. It's well built for an ARF and it goes where you tell it to go, (at least I think I told it to go there).

The other 2 are common Flat bottomed trainers. They are good, but I can really see the difference.