I have one. It's hard to beat the price; features are good; I'm just not in love with the switches. If I recall correctly (and I might not; it's been a while since I've used mine) you have to use their proprietary receiver.
I prefer the Ampero Control 4 overall, although the Control 4 doesn't have an onboard battery, which just about defeats the purpose for many applications. But if you're building a pedalboard where you already have a 9V power supply available, the switches are superior IMO. Programmability and compatibility with receivers is probably better, too. About 4x the price, though.
My first choice is the Paint Audio MIDI Captain, which I never stop carrying on about. 10 switches, support for rechargeable batteries (in a AA compartment), and extremely low latency with Paint Audio's proprietary receiver. Somewhere around $150 for the switches and said receiver IIRC.
P.S. The "documentation" that the M-VAVE ships with literally looks like the fortune out of a fortune cookie. Microscope sold separately.