What guns do you intend to test with it? I've used one a number of times and have been very pleased when testing lower-recoil cartridges, less so on powerful ones.
When the .500 came out in 2003, I tried it in a Ransom Rest and couldn't avoid massive vertical stringing--a foot or more of vertical dispersion at 25 yards with less than an inch of horizontal. This was even after dozens of rounds fired to "seat" the gun in the inserts. Maybe I needed a stronger spring or I was doing something else wrong, but I never could get good results with the .500 in the RR.
OTOH, I have a lot of experience shooting handguns off sandbags, especially scoped. Resting the trigger guard on the bag (not the barrel) and paying attention to uniformity of grip, I can outshoot a RR with a scoped gun in any magnum caliber every time.
It might not be feasible for every gun you want to test, but temporarily scoping your gun and shooting it off sandbags would be a lower-cost alternative to the Ransom, with better results if you're shooting revolvers with heavy recoil.