Well, I can't speak personally about the quality or value of their products as I've never ordered from them. I'm definitely not a fan of their marketing strategies, though.
As far as ordering larger plants/longer growing season, etc: a banana isn't going to bloom/fruit in one growing season anyway, so you may as well save some money and buy a smaller plant. Maybe that's just my view as a fellow cold-weather grower, though. I dunno, if you want a larger plant, try filling out a
classified ad to see if anyone on the site has what you're looking for for a good price. I guarantee that members here are more reliable than TyTy for getting what you ordered.