Used a Pig Saddle for a while. Very versatile but also heavy. The twist to lock and unlock was also not as convenient as say a lever design. If you want maximum stability and are willing to tradeoff on weight and cost, hard to beat a RRS dovetail head. If you are willing to compromise a bit and have rifles with pic rails on the bottom, I have found an ADM lever clamp with a simple leveling base works very well too.