depends what you want it for, with areas with a noise problem, they are the mutts nutts, but if you in a field in the middle of nowhere, a normal shotgun would be better, found a shop that stocks the hushpower carts, but a bit pricey at £6.20 for a box (25)
the other carts I quoted at start of post, velocity express are ok on the clay days, slightly more of a bang, but the velocity competition are way too noisey, so ended up using them in a mates over and under
Im still a lover of the hushpower though, alot of places now are looking at noise issues, so a mossberg pump is to be my next