We have had one since April and I really do like it. It uses quite a bit of ink for it's automatic print head cleaning, but if you can ramp up your output then I think it would offset that cost.
We got the roll to roll option but not the white ink. I've only heard bad things about the white ink option and I don't foresee us ever using it so we passed.
It prints onto banners, cor-x, sintra/styrene very easily. I've done a few jobs on aluminum and dibond but I still get worried if the material isn't totally flat before printing. It has a way to lower its rollers to hold the material down but you will lose 12" on the front and 12" on the back (approximately).
Really our only problem with it is that is finding more work for it.