The Alpha 40 is a great flying trainer. Price is the only reason to consider other options, but the Alpha 40 is a good value so long as you can afford the cost of admission.

Edit: On second thought, getting an even bigger glow trainer, like the Alpha .60, might be a better investment. You could go with a larger bird for better stability. The Alpha .40 is one of the very finest .40-size glow trainers on the market, however. So price and size are the only reasons to consider other options.