Hi there,
In my view if it comes up at a good price, grab it as it's a very good piece of kit. The pre-amps are very good (same as the VS-700) and the whole thing is well built and robust. Being able to take it out to a live gig and record to the SD card is a real bonus. The 6 outs are very useful, and, whilst my Zoom R16 has 8 ins and can also be taken to live gigs, it only has 2 outs.
Roland were very quick to bring out Windows 8 drivers for it and although I don't use it with W8, other programs with W8 drivers are being reported as very stable. Maybe someone here can give some feedback?
There is quite a large user base worldwide so I think they will support it for some years to come. They have released several OS updates, one fairly recently, so the omens are good. Even if it is not supported in the future, it is a solid piece of kit and, unless it breaks down, is likely to give years of good service.
Gary