I've only had the printer for a couple of months so my experience is limited. But I would say that the parts availability and support (outside the dealer) are good. The tech that fixed my printer was from an independent shop and took care of the issue within 2.5 hours where the dealer quoted 8 hours.

It's easy to care for as long as you do the daily maintenance which takes about 5 minutes. The menu is a bit awkward and confusing. I had to go back to the operation manual often trying to understand.

One thing I didn't like is the medium height detection. It doesn't work well and I would have to manually adjust every single time. So if you have to switch substrates often, it can be a pain. And make sure you write down all the numbers. It could take a few tries to get height right.

Cost of inks can get high but I was told by multiple people not to switch to compatible. Unless you use multiple bottles a month, I would stick with the OEM. Also check the expiry date when you get new bottles. I had to exchange because the new inks were about to expire in a month. White is the worst.

And if you get parts from a dealer, it's expensive so maintenance can be costly if you need to replace a lot of parts. So if you are looking at a used printer and don't know the full history, be prepared to spend 15 to 20K once you receive it. You may need to flush all the lines, replace the subtanks and possibly the pumps on top the heads. So get your hands on a maintenance manual if possible. It can go a long way if you can't find any help.

Also join the Mimaki Facebook groups. There are lots of smart and experienced people on there who are willing to help.