I was up at my mates 2,000 acre cattle property last weekend with all the guys, as we all wanted to get in some practice & check the rifles were sighted in prior to going on our various planned hunting trips in March. My mate has a Caldwell lead sled which we used to check 5 different rifles, 4 of which were 30-06's.
I like the Caldwell lead sled as it provides a good steady rest ,& checking of rifles zero can be done relatively quickly. The lead sled does have to be readjusted between shots, but I find it quicker to align than if Im using sandbags.
The Caldwell lead sled is cushioned where the stock fits, and the lead sled does move backwards under recoil, as it is not bolted down. I wouldn't be too concerned about stories of the occasional stock being broken, as there can be many factors that influence a weak/brittle spot in a stock both wood & synthetic. There has been plenty of cracked stocks on rifles that have never been anywhere near a lead sled.
While I find the lead sled good for sighting in, or checking differences in ammunition, as a hunter I much prefer to practice shooting using improvised rests such as trees & fallen logs, & guessing distances while walking around my mates 2,000 acres.