Farleys
I don't know about Seb's rests but I find that Farley's will get grit in them, depending on where you shoot, and will start feeling rough. You'll start fighting it by applying more pressure then you used to, it'll break free and overshoot the desired aim point, your attention will suddenly be diverted from the conditions to getting to the aim point, and life will not be good. Then in the middle of a match you'll get clever and reduce the tension to the point that you start feeling the shock of firing move the rest around in your left hand and you know that can't be good. And this whole process sneaks up on you rather slowly but it always seems to reach that "ah ha" moment in the middle of a match.
You really have to maintain these things, they work well but you have to keep them clean. Stuff can come in from the top but there is a sliding plate on the bottom with grease that is totally exposed. I bought some naugahyde fabric to make a "Farley condom" for the bottom to help keep dirt out and hopefully, to keep this thing operating better.
A good buddy of mine keeps brow beating me to return to bag squeezing and I haven't ruled that out but I'm going to try to keep up the cleaning routine on this thing first. When they work, they're great.
Few things are set and forget in this sport, IMHO. Maybe, "Oh crap, I forget where I set my truck keys". That's about it.....