Necrothread but just to add onto this because I could never find much info about it, I was pretty skeptical but I recently tried the sled feet on an accutac and as others mentioned on hard/flat surfaces, wood, concrete, even rubber mats on benches I really find the sled feed easier to shoot off of than the standard rubber feet. Especially on grippy surfaces like rubber bench tops the sled feet really seem to move more predictably under recoil. Prone I feel like it makes less difference, probably because it's easier to do better recoil management but on a bench the sled feet really seem to work nice. There was not a huge difference in my groups, but overall across a few rifles it's enough to notice back to back. You can really see it on a bench while trying to spot shots that the sled feet seem to have way less scope view disturbance and the path of that disturbance is more consistent.
The only thing I've noticed is if you are shooting at a good incline and you start to rock onto the "toes" of the sled feet it gets noticeably more unstable, same is true if you have anything off camber, which makes sense. It would be interesting to try the ski feet they have that always stay flat no matter what the tilt of the bipod is. I did not like the sled feet in soft materials like soft dirt/sand. Mostly because they seem to "dig in" every shot quite a bit and require significant elevation changes, where spike feet seem to sink less once you get them planted from shot to shot.
