I have played with a bunch of red dot scopes and I think the tasco, even though it is inexpensive, compares well with the other ones out there... for a little more I also like the bushnell as it has many different interchangeable recticles.

I think it will work fine on a shotgun, even with the heavy recoil... But if it doesn't you are only out 30 bucks. I put a Bushnell Holosight on my Turkey gun (12-gauge 500 mossberg) and it works great.