I've got a few MRT speedo's starting with one of the first a hfx P9000, got 3vtrac's and 2 vx pro's they've all been bullet proof !
The MX is supposed to be wicked and for the price i should imagine it puts a few big names to shame...
The TC boys like the MX, and as has already been said the backup from MRT is second to none.
But a second hand Vtrac (either the x98 or pro) or a VX would be a good buy.