I'd imagine it's a decent shuttle. The "practise" shuttle for the AS-40 tournament shuttle so in theory, despite more imperfections than the AS-40 real deal, it should certainly be better than for example, AS-10/20. I'd imagine that you'll really enjoy using it in social games but I'd certainly go for one of the actual tournament shuttles (AS-30+) when playing with an opponent I respect or for tournament play.
thanks.... im in low budget, and only yonex is the decent shuttle available in the dept store.... i cant afford the AS 40+ cost nearly 2X AS 4
As said AS-4 is a great shuttle for practise, especially if you play in tournaments with AS-40s. Anyway, it's a great low(ish) budget shuttle.