I have had many newbes come to the field with fast trainers but the best trainer i have ever taught a newbe on is this one.
http://www.sigmfg.com/IndexText/SIGRC58ARFB.html .It will do loops and slow rools but it just flys so slow to give them time to think. When they are done training with it they can put a candy drop in it or mount floats for water use. With a 80 inch wing it is easy to see also. joe