I have been working with the local HP reps on this for a while, I have heard no downside and no objections that could not be answered as of yet. I will be participating in an open house where we will be showing it off in the next few weeks.
Its based on the Z6100 platform, which was the progression from the HP5 series, a very well proven pedigree. The heads are a throw away like previous HP models, and the ROI including head pricing is competitive with the price per sq. foot on similarly priced solvent printers. It does use some post curing which prevents drying in the heads, pumps etc which was my main concern, thinking of the residue on latex paint guns etc. Seems to be a non issue. The larger HP latex machine has been out for a year now, successfully and would probably be a much bigger seller if it was not a bit of a goofy size.
Longevity claims seem to work a little different than solvent but not by much, I was told 3 years unlaminated, 5 years laminated. It does not need specialized media.
I would check on RIP compatibility to your favorite RIP software, HP is well supported by RIP manufacturers but with new machines this is always a concern. I know its pretty well supported but I cant find my notes on by who.
Hope that helps. Anybody in the Ontario, Canada area that is looking at these let me know and I can send out info and arrange to have you at this open house.
Craig