No DTG printer, no matter what some may claim, has mastered white ink technology. They all require pretreatment in order for the ink to stick, meaning they break down very fast when washed if the formula/combination of factors aren't
just right. Tjet claims they have their own white ink, but I'd like to see some proof to back that up before I'll believe it. Do some research, most of those 'in the know' would recommend waiting at least a year for the industry to grow up a little bit before you even attempt to print on dark shirts.
We're currently shopping for a DTG printer and like the Brother, it doesn't need any retarded RIP software or pretreatment, and holds up good in the wash. It's simple to use, but it isn't offering white ink yet.
I'd say be wary of ANY printer offering white ink
Go to
www.screenprintinguniversity.com. it's a GREAT resource for anyone looking to get a DTG because it has all of them listed in the same place, you can talk to the people who actually have them, get their feedback, and ask them questions