Hmm...that's pretty nice. I will have to take that into consideration. Did you use any additional adh promoters or just print straight to the glass?
No adhesion promoter at all. I will say that the ink did not have as good of flexibility as other inks did but just a small difference. The white ink did not have flexibility at all but they may have corrected that by now.
I did test other aggressive inks with adhesion promoter during that time and they did not come close to those inks.
Do still do your due diligence and request samples.
In my experience with ink, the more aggressive the adhesion and more opaque the white, the more maintenance and likelihood of printhead concerns/issues.
Keep in mind that every printer does the same thing. The difference is in the technology, quality of build, service/support, and most importantly the quality of the ink.