Just installed dual AimTraks with recoil on my MAME cabinet and couldn't be happier! One of the easiest, if a bit costly, adds beyond regular joysticks (vs. having to rework my control panel for a trackball, spinner, etc.). Setup was much easier than I expected.
I'd read so many threads where people seemed to have issues so I was a bit afraid to spend that much money, but no regrets at this point.