I've used this with Novations, Rolands, Yamahas, Korgs, DSI synths and Millenium-branded keyboards.
It worked perfectly with all of them and I've never had any issues with it (I think I've had to use the polarity switch on the back with some of them, well done Lead Foot for including a polarity switch!).
I currently use it as a STOP switch with Ableton Live (via a DSI Mopho SE), using it to stop loops and clips at the end of songs, so I stomp it pretty hard. Because I'm abusing it, I bought a spare, just in case.
It's an all-plastic body so it feels flimsier than a metal pedal, but it's put up with years of abuse from me, and there's hardly a mark on it (and I wear UK 12 boots onstage).
In summary: functional, inexpensive and impressively durable!