For serious International style airgun benchrest, the best front rest overall is probably the Randolf. The Farley used to have a following, but the ones I tried did not cover the entire target including sighters unless they were modified. There ARE other good rests, but to me the Randolf is easier to traverse which maintaining steadiness. I tried the pricey and beautiful S.E.B. model, and much prefer the Randolf. Stay away from the Caldwel Fire Control unless you are a tinkerer in my experience, since they have tons of sticktion unless reworked. The S.E.B. and Randolf have sliding sidewalls on the top to adjust to any fore-end, which is the best system I've used for accuracy and versatility (I used many different guns).
The above said, there is no huge advantage to these fancy rests, since there are many fine scores being fired with very simple bags up front. The fancy mechanical rests are needed more by folks shooting "free recoil style", where the aim is made, then the shooter waits for the wind to be right and lets off the shot without even looking thru the scope.
Wise money will give more points per dollar when spent on decent windflags than fancy front rests.
Note, the above is for SERIOUS shooting. To me, most any rest is good enough for informal matches, and I've used all sorts of homebuilt stuff too.