The problem is not the hog saddle, that is as perfect solution for many, including the pig saddle. The RRS Vyce is smoother to operate and I believe might be a tick wider, but you would be hard pressed to go wrong with either option.
The tripoid legs are the issue. Most are using a Manfrotto that is only rated for 15LBS vs the RRS tripods, even the Feisol that are rated for much, much more. 50LBS on average. The new Tripods from Hog Saddle, are better they are rated for 40LBS and only cost about $150 more than the typical Manfrotto.
Back where this was a one off shot, the Manfrotto tripods were fine, but since moving to the better ones, and shooting them a lot more often you quickly see and feel the problems of the Manfrotto. Do they work, of course they do, but not nearly as effective as the tripods rated to hold more. It goes beyond just the rifle, it's the balance, the recoil, the shooter's weight or lack of, all play a part into the shot.
I recommend for those who don't want to spend RRS money, too buy a set of legs from Hog Saddle and then use the RRS ball heads. If you get the Feisol you can use the leveling base from RRS on that set of legs. It's a compromise as the RRS is tits, but the combination of Hog Saddle and RRS together is about the same money as doing it on the cheap, and it works much better.
Consider this, even the smaller RRS legs are rated higher than the Manfrotto ones most are using. If you look too, there are equivalent Manfrotto legs to the RRS ones, but they cost the same money (a clue there) so nobody ventured that far until RRS came along.
I also dont recommend skimping on the ball head, the knock off heads are not nearly as good or easy to use as the RRS, and compared to the competition you are not saving enough to skip the RRS heads.