On our JV33, we print on art canvas, a few different fabrics, couple of different types of paper, heat transfer, backlit film, direct to styrene, of course banner stocks and vinyls, as well. All print great on Mimaki's...... You need to get an Eye One and make your own profiles though if you want decent results. This of course required learning a good bit about color management, linearization, ink limits, GCR, and whatnot. But to say a Mimaki is only good for banners and adhesive vinyl is laughable and simply makes you look ignorant of how to use these machines properly.
Sure, you can use it like your home inkjet printer and just take it out of the box, load ink, load the outdated drivers and RIP that come on a CD with it in the box and go. Actually I'm starting to encourage this as the more poor product people put out the faster they will go out of business which will ultimatley result in more business for those who did their homework and know what they are doing. Windows comes with notepad, sure you can use it to write letters and even write a book. Do you? Or do you get something a bit more useful like MS Word? This is similar to canned profiles and free included RIP software. Yeah they can work, but generally not extremley well...