I actually just purchased one 3 months ago and the reason I chose this machine was because it can print up to 6" thick substrates. Although you will rarely ever get a request to print on something that big, it was beneficial to be because I also do laser engraving, sublimation and a lot of other things and this machine works great for promotional items and bigger more expensive crystals that are thicker than the traditional 1-3" flatbed machines.
I opted for both the white and clear ink even tho I can't see myself utilizing the clear as of yet but again I am also not marketing it. Like you said all machines have pro and cons.
Going back to what you said I personally LOVE my roland and i tend to usually stay with roland products because they have been great for me, so the biggest pro for me is the thickness and the prints that come out with my machine at even the high speed low dpi settings comes out great. That being said the bad things about this machine are:
1. the speed is pretty slow at high speed settings on a 4x8 board with full color saturation takes about 24min to print
2. the table vacuum is not that great on how it is made, the 4 zones are not really configured correctly in my opinion at least
3. there is A LOT of auto cleaning so ink seems to go faster than i expected but i am pretty sure most machines will have that problem ( i factor that in my pricing so no big deal to me)
4. because of how high it prints even time i re hone the machine takes longer than i like because it goes all the way up and comes back, again i can deal with it because when i am printing the same substrate i don't need to hone or level it out i just return it to origin at the same head height and keep printing.
Sorry if i was rambling or not making sense in my post I normally don't post but i will be more than happy to answer specific questions if you have them, i did demo other machines and I don't regret my decision with this but my next machine will definitely be for speed and production