I think you are talking about a bipod that clamps onto the swivel stud. If this is the case, I own a Harris bipod that is currently sitting on my Savage 7mm Rem Mag. From my standpoint, the Harris bipod has been exceptional. It's adjustable from the prone position to the sitting position. I hunt a lot out west and feel pretty comfortable taking shots out to 300 yards using the bipod. While that's not a really long shot for some people, I'm a Kentucky boy and a 100 yard shot is a long shot where I hunt.
As far a stability, the bipod clamps around the stud and is tightened by a screw head. Hand tightening the head will firmly attach the bipod to the rifle and the bipod becomes very stable. You can't go wrong with a Harris.