I've run a few prints on one, John. The build quality is very nice and the prints are comparable to the output of a 3800/3880, just on a smaller form factor.
I haven't done any quantitive tests on speed, but it seems quite reasonable.
For that end of the market, the ink cartridges are something like 2 or 3 times larger than the average (specifically it's predecessor). The WiFi could be handy, too.
If you have lower volumes or space restricted or just never print larger, then it's definitely a nice option. For higher volumes and larger prints, the 3880 stacks up as being more flexible and more economical.
I haven't done enough prints to have run into any problems, so can't comment in that regard. Also, I've only printed on one paper, so again can't comment in that regard, either.