iv'e been purchasing from them for over a year, some shirts have felt like a different fabric at times but the prints are nice and clear and they smell nice too, you always get a free sticker too.
edit: i recently got a duvet and the print was a bit pixelated, i was not happy with this since i paid $150 for my duvet. i expected better quality since i am paying top dollar.
edit: okay I went ahead and purchased a lightweight hoodie and i was kind of disappointed, the print felt rough and it was slightly transparent, however.. to be fair, the hoodie was black and the design was neon colours, putting such a bright print on a black hoodie sometimes can not turn out so great, so i decided to keep it instead of returning it, i expected better though.
I had to send a shirt back because of this problem but it was a really bad print, the customer service was great though, i had to send them a photo for proof but they sent me a much better shirt and let me keep the old one which was really nice.
I have purchased around 20 pieces from red bubble and i have only had a problem with 2, all others were fine which is why I will continue to shop there.
edit: okay years later i got a post card of a persons face and they sent it to me with the entire thing blackened out... why even send me this? ridiculous. i have had good clothing from them but the post cards are trash.