With the wind rings you can actually play unimpaired yet even in moderate winds. The game itself requires quite a lot of feeling for the ball because the ball is very fast and must be beaten with a lot of feeling. Who but well playing badminton, will have a lot of fun here.
For children I recommend to use the "normal" Talbot-Bisi rackets (badminton) - they are cheap, easy and keep the ball loose.
For casual players, the set is certainly not cheap, because it might be worth more to take a few cheap badminton racket with decent clothing and then only buy speedminton balls. Fun is also guaranteed so!