If you just want a FAST style/opscore, of the cheap Chinese knock offs the FMA ones are definitely the better ones. They do have both dual sized (M/L, L/XL) ones and some REALLY cheap one size jobbers (avoid those). I have a "PJ" style FAST, a Maritime and a Team Wendy (all FMA) and they have been great. The PTS Flux is an officially licenced MTek copy and is better and more expensive than an FMA but if that's the style you want then it's a no-brainer.