I use tshirtgang on 3 of my websites. The premium tees and hoodies are really good quality for the price. The hoodie shipping is insanely expensive to ship, so I offset it and take a hit on my margins and "reduce" the client's cost.
They sometimes ship the wrong item but don't ask questions and send the right one right away. The support and integration have a lot of problems, but for the price and tee shirt quality, I still went with them. In addition, they ship to Canada with no duty fees so that's EXTREMELY CRITICAL to my businesses.
I'm also not sure if it's their app or another app but my collection pages are slow. Pros and cons. Clients always say the tees are amazing quality so I can't complain too much.