What always concerns me is the goofy ways aftermarket extensions have to attach. Be it Taran's pin/set screw nonsense or a screw-on plate in the back or in this case the set screws. Granted, I've seen some factory P30/VP9 mags pop their base pad and dump ammo everywhere, It makes me uneasy to have magazines with screws...especially given that such extensions like to make note of the weight added (for a harder impact when dropped...even empty).
Great aesthetics though...probably some of the least offensive extensions I've seen. I like how they allow for some compression (noting they could potentially fit 6 in the +5).