I currently have a Xante En/Press and a iJetColor NXT which is just the mach 6 rebranded, they both are great machines once you know how to run them.
The En/Press is great for higher quality output, but since it uses toner, you need to use digital window envelopes. I limit this machine to around 5,000 envelope runs because it's cheaper to run on offset after that.
Another advantage of the En/Press is its versatility. I have a job that's 11 x 35 inches long on 60# text, which I wouldn't have been able to do before.
I bought the En/Press in 2019 primarily to produce plates for my offset machines, but I would advise against it for that purpose. We could never get more than a few hundred sheets off the press before it started breaking down. Even an Xante rep couldn't stabilize the plates. However, we found a use for it with their iQueue software, which made some jobs easier. Now, it handles small tasks like raffle tickets, envelopes, and similar items. Just avoid anything with large solid colors.
The nxt i have kept it to simple jobs as it seems to do good on the high volume runs the ink from ijet is super expensive which is why i run the aftermarket ink and i have never had a issue with it and the ink is about half the cost
of the oem stuff.
I bought the NXT about a year ago at auction with only 90k impressions on it i payed 11k so if your frugal enough you can find them on the auction sites i got mine off wirebids just be careful who you buy from on there i got mine from printer.strategies and they tried to not give me some of the equipment that went with the machine... I had to fight and get legal invalved to get it.