Grex1200 is a bit tricky to set up as it requires a BPPC rev. 2 in order to properly work (or work at all in most cases), and the Grex4000D version is rare, but works with all CSMKIII or CSPPC cards without any compatibility issues.
Both versions of the product are very stable and work great once set up properly. Grex is the fastest PCI solution out there due to communication through the local expansion slot of the CSPPC or BPPC which is faster than Zorro II/III bus (used by all other pci busboards).
