We have one, and a niche for which it works... however, yes it is VERY SLOW... often run behind on jobs... needs a lot of babysitting, so take up roller printing overnight can be forgotten about. We do ultra-high-quality work, so maybe if you have a more volume less quality situation you could print overnight.
Lately we have had a consistent problem with banding in the clear.. Roland has been out thrice to try and fix it, to no avail.. I am now constantly re-calibrating the machine to stop banding... very time consuming, pain in the ass.
Unless you are doing very short run specialty jobs, maybe consider another machine, pay some extra cos you will save it in labor. If you have the niche and can charge to run it accordingly, then its probably ok.
The flexible inks are very nice, durable and flexible. Excellent for printing onto polycarbonate... good white ink.. when the machine works properly, it provides a good product, just slow.... and at the moment, with it not behaving itself, its a very costly boat anchor!