Our company, located in NYC, has put 11 million impressions on our C7000VP (with retrofittings for 7010 update) and recently obtained an 8000VP. After testing everything from Ricoh to Xerox, the 8000VP came out ahead while only the Indigo put out a better print. I can't say we weren't biased from our experience with the earlier model though, it was a workhorse. We're constantly running 350gsm, 4/4, at 13x19 in a number of different finishes (smooth, satin, C1S, etc.) and switching to text weights, 12x18 and 11x17 sizes in between larger runs to accommodate quick-turn jobs -- these operations put the equipment to the test to say the least. After a few minor glitches shortly after the initial install of the 8000VP, it has been stable and holds calibrations very well. We hit G7 without issue and we were within spec for G7 after 400,000 impressions without any tweaks, so again, stability. A lot depends on your technical service provider and the knowledge/experience of your operators and their familiarity with EFI-CWS.
Tested the C850 as a backup machine, struggles to push through our most popular media weights...probably because it's not rated for anything over 300gsm I believe. Prints are a little too saturated for our taste...well, our clients' taste anyway.