im still in my trainer stage.i got a alpha 40 and alpha 60 trainer.the 60 is much larger than the 40.the 60 is a breaze to fly compared to the 40.my opion is the larger the better when training are flying after ur training allso.i heard the sig cadet senior is pretty big to.hope this helps u out.landing these birds for the first 10 times is another story.be ready to change lots of props when u start to land on ur own.i keep 5 on stand by every time i go fly.good luck and happy landings.