The way I feel about the wsms is this: yes,they are of better overall design compared to longer,skinnier cases,no,it's not worth it to trade if you already have a good rifle in that caliber,yes,they offer a good choice IF you don't already have a rifle and are looking for 1. As to the other short mags,imo they won't be around in 20-30 years,most likely a lot less (as far as chambering factory rifles).