I have the Artisan 730 with the hotzone360.com CISS system. Works very well.
I have had some issue with dark prints as noted above. They come out a bit darker than on my monitor. My monitor was calibrated with the built in software (not external like with a color spyder) and when I'd send images to to Costco to be printed, they'd come home matching the monitor pretty close so I did not worry too much about the calibration (as it, the monitor matched my output and that's what matters).
When I first got the Epson, the prints came out much darker in color (greens were black, whole photo was 'dark'). I did a lot of googling and have fixed the setting and things are better, but I'm still having trouble getting it to match my monitor as well as I had before by going to Costco to get prints.
Regarding ICC profiles, If I soft proof with the Costco profile in PS, the change in the image is barely noticeable, when I soft proof the Epson profile, the change is VERY noticeable (again - dark).
I really wanted to take more control of my prints, have them immediately available and the cost with the CISS and Costco paper (300-4x6 sheets is $10 at the warehouse) is less than sending the prints to Costco. My old printer was dyeing AND the ink we expensive. Office Max had a $100 off the 730 so I picked one up.
Now I have to adjust how I do things b/c what I see on the monitor is not what I get on the printer unless I soft proof and adjust the image. It's not a HUGE deal, but it is one more step I have to deal with.
Regardless of which printer you buy, you're going to have to deal with color profiles and getting things to match up with the camera, monitor and printer.