I have used them all and the Jomar is OK. The issue I have with it is that the servo throw is preprogrammed and it doesn't seem to match the throw of the valves very well. Having said this, you can play with the position of the servo arm and eventually match the throw of the valve. I find if I start at 90 degrees and end up with the arm pointed at the valve to cut down a bit on the total throw, that works.

Give a choice, I prefer the JMP sequencer. The throws match the valves better and I like the fact that there is a positive cycling of the doors when I turn the unit on. Tom Cook is very easy to deal with too. I have used his sequencer extensively without a single issue.