The venue was open to the idea of buying the SP-4, and everything works great!
My one critique though would be that it would be awesome if you made an SP4-Lite, that doesn't have all those bells and whistles. The one thing that screwed me up in installation was that you don't have a simple, 4-channel operating mode where each fader operates a dimmer. Why do you need a master dimmer for a dimmer pack?
But that's a small thing. No big deal. The unit works well. The client is super happy!