I was astounded to find that an order can't be cancelled no matter how quickly you try to do that -- under an hour in my case.
Also, the print quality is very variable -- it is cheap as chips and the print quality matches that I guess. If you want high quality printing, this is not the place to go. Colours that are the same throughout documents often print differently across different pages; frequently the print has roller marks etc. When challenged, they will often refund but that is a waste of the customer's time. So don't use if you're on a deadline.
For fast and cheap it is good; customer service -- poor.