I'm a local illustrator/artist and I've been getting t-shirts made from ACME for years now. I'm super particular about the type of shirt and inks they use and so far the quality of the shirts and screen printing is top notch.
The only time I've been slightly disappointed was because the linework in my own artwork was too thin to clearly show off the detail with the water discharge inks; when I mentioned it to them they said that they'll have their art guy talk to me next time so I can make sure everything is perfect. The shirts are still solid and I'm happy with selling them though. So - if you have your own artwork be sure to spend the time to go over it with their art guys - it'll be worth the time!