Howdy Ghost --
I haven't used their display, but I'm using the OEM instrumentation head (RDAC X) on a project to pull data off of a Rotax 914. This is the same instrumentation box that catches data for the Strato and Ultra systems from MGL, I believe.
The only issue we had was a zener diode that was incorrectly sized in the tach circuit. Luckily, the tech support from MGL Avionics was excellent. The guy that runs MGL (Rainier Lamers) is top notch, as is the fellow over at Sport Flying Shop (Matt). The product certainly has a favorable bang:buck ratio.
I thought they were working on a color version of one of the MGL products not too long ago?? You might wanna quiz Matt on that one before you drop the cash on a monochrome unit.
D