Grip looks ugly but is actually very comfortable to shoot with especially if your using the push/pull technique.
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What loads are you shooting with it?
I've got a nicely-optimized 590a1 (good recoil pad, customized LOP) and while it isn't painful to shoot, I certainly wouldn't call it "comfortable." Shooting full-powered loads with a 12 gauge where you don't have a stock with a recoil pad (and thus your dominant hand is absorbing most of the recoil) can't be any more "comfortable" by comparison.
The only useful purpose I can think of for a shockwave is as a small, easy-to-store vehicle gun. For just about all other applications, a regular stock shotgun will aim more accurately and its recoil will be much easier to mitigate.