I decided to use two different online vendors for my invitations -- MyGatsby.com for the pocketfolds, cardstock to frame the invitation, and the outer envelopes, and Wedding Paper Divas for the actual invitation and enclosures.
The turn around time for MyGatsby was very slow with comparison to Wedding Paper Divas (two weeks for some cardstock, while I had received my designed and printed invitations in the mail from Wedding Paper Divas even before I was sent a "Processing" status from MyGatsby.com.
When I needed to revise an order, I emailed and received a prompt response, but I had to later call on the order to make sure it was sent (no notification on 1 of 3 orders), and then when I received it, the change had not been made.
MyGatsby also does not include packing slips or order forms (or anything) with their shipment, so that may be the reason why my order was botched (and late).
I feel like my experience with them was satisfactory, but comparing them to my experience with Wedding Paper Divas (and I don't mean to make an ad out of this), I really would go out of my way not to use MyGatsby again.