Kahntrol Solutions also makes one that looks pretty nice.

I'll be the first to admit that clamp-on style muzzle brakes seem a little sketchy, but I've heard of people using them before without much of a problem. Thread-on brakes are always going to be preferable because you can pretty much guarantee that they will stay indexed correctly on the barrel. Clamp on brakes will always be liable to come loose, no matter how much you tighten them.

In addition, I'd assume that POI shifts would be much more prevalent with clamp-on brakes because they can move around, if nothing but the slightest difference from one shot to the next. That being said, any type of muzzle device that you install is going to have some sort of positive effect on felt recoil and muzzle jump. Performance is going to have a direct correlation on how much you're willing to spend, so it's up to you to decide what type of consistency/accuracy/recoil reduction you're looking for, and then how much you're willing to spend to get there.