So I was at the local Cabela's the other day to pick up a bipod, and the only Harris that they had that swiveled was one that was in an open package, that someone had either opened and looked at, or returned (it looked more like a return to me). So I passed and didn't get one. But, they had a whole rack of Caldwell and some other brand. Are Caldwells decent? I'm assuming that a swivel is better than a non-swivel due to uneven ground or tables?