We have a Pro cutter and love it. They are great to deal with.
Al Dunning uses/helped design the Cow Trac mechanical flag and I would get a Cow Trac the next time I get a flag. You can adjust the speed from the hand controller. All the other flags I have seen (including ours) you have to change the speed on the control box. I find it very annoying to have to get off and adjust speed all the time. To have it on your wrist would be great. That would be the only reason I would switch.