you wont get bored, you'll be too busy trying to fly it!
one thing in a recent thread, a guy was so used to his trainer, he couldnt land his next plane coz it was diffrent, at least this way you have a plane to learn on, learn aeros and you wont have to relearn how to land.
i didnt notice my student improve any slower than the kid i taught with a propper trainer, they both learn to fly their planes.
if you wanna talk real life, kids are taught in brand new cars now, hardly a trainer, they just learn how to drive it.

stick with something easy, nice big wing, no tapered wing stuff, no pattern ships, no scale, just a nice sport plane. if i had a US mag i'd tell you a short list.