They double charged me for shipments to the tune of $25K USD over the course of four months, continued to do so for two months when I notified them of their error, and then reimbursed me three months after that. One in 200 packages gets a "no-first-scan" error where the parcel is simply lost outright, and I have no recourse or reimburse for the contents of the order, must pay shipping for a new order to be sent out, my customer gets their order three weeks late, and I only get a partial reimbursement for the shipping cost in most cases, but only if I petition them. One in 250 parcels has a transposed item mistake with another parcel, and I've had it twice in my short tenure that my customer was shipped a product from someone else's store, and I was charged shipping for both shipments, and had to petition to get a reimbursement. Many hundreds of orders had a tacked on oversize charge of $4 because their auto-rule packed everything, even something the size of a pack of cards in a 24" x 24" polybag, and even if the polybag was folded and taped, that counts as an oversized package (one dimension over 20") in their eyes. Now, any PO box addresses will count as a Zone 9 charge (think, Australia), and also they are tacking on $500 a month for simply using their software. Edit: So with the issues above, why four stars? Aside from the no-first-scan issues, a resolution was found eventually. The prices are good if you can weather the $500 a month, and the support is good to - although I do find it underhanded for the company to have their individual support agents request for reviews - as though you're reviewing the agent and not the whole platform.