I have been given one lead sled as a gift, then ended up buying another as part of a munitions development testing project, I have since given both of them away. Teats on a boar, in my opinion.

Good rear bag, good front rest and proper technique, you'll outshoot a lead sled.

Also, mind you, your MV and POI will be different when shooting from a firing fixture vs. shooting manually. You'll even see MV and POI shift for variance in position, and variance between free recoil vs. shouldered firing.

Lead Sleds are for dudes who never actually shoot their rifle, recognize their technique is weak, and have more dollars than sense.