Are these things worth a crap? I spent hours trying to get the timing correct with no luck.

I'll adjust the one that needs to speed up or slow down, and it affects something else that then needs to be adjusted.

I'll stick to robart valves and an electronics to do my timing. I would have been done setting up the gear and doors by now.

The couple of guys that have used them around here. Have had the same trouble.

I've heard that they work great also. whats the deal?