We just got this one a couple of weeks ago. Like the Seiko we first bought years ago (and all the aqueous printers before that one) there is a learning curve. Here are some thoughts (in no particular order)
1. It's very nice to not have that lingering solvent ink smell any more. I thought it was going to be a part of my existence forever.
2. The biggest issue (for everyone, it seems) is learning the eccentricities of the heaters. Different media require different temperature settings. Not having those right can cause wrinkles or waves in the media, actual heat blisters on backing paper, an oily residue from inconsistent heat, or even ink that will not dry because the heaters did not properly remove the water from the ink.
3. I love the concept of easily and inexpensively replaceable print heads. With the Seiko I always dreaded the day when one or multiple print heads needed to be replaced. For the record, I used my printer for 6 years without replacing a head. The Colorpainter I had before (the one that became a Katrina victim) had countless heads replaced because of the early ink problems.
4. Blacks are very matte with this printer. Other colors have more gloss but the black is matte as can be. The output is very, very nice - just not very glossy.
I have a Seiko CP which is not printing very well and is ready for retirement, I have a 5500 which I am just about to replace the tube system on and I love it. but it won't ;ast forever.
I can get a new 25500 for 15k plus bits $17k evewryone i know who has one has overcome the heater probs.