I agree the product is awesome.
I'm running 3 cards and XITE on the same machine. Stability is not much of an issue, as 80% of my crashes are caused by me opening or closing stuff in the wrong order, or not waiting a few seconds for Reason to close before I close Cubase.
If I treat the system with respect and patience, and avoid 1 or 2 plugs (out of literally dozens) on XITE that can cause an issue, or overloading, everything works fine. And its running even finer since I blow cleaned the ADAT ports.
Im running 3 or 4 synths, a 32 track mixer, 3 mastering plugs, a dozen plugs inside the mixer (inserts and sends), a couple of instances of dynatube, meters, routing all with my 12 DSP PCI cards 10 years old loaded to 95% and XITE around %55 - and the XITE is the 1D one - yeah the small one with only 4 of the newer DSP's .
This really is a shitload of stuff all running at 48Khz and then throw on top some Kontakt or Halion VST's plus Reason while Cubase plays back and records simultaneously at 32 bit float. So aint got no complaints here and lovin the quality.