Florin made a head to head comparison of Seeed and ITead’s inexpensive PCB services. He made the orders with the same design files, on the same day. While the Seeed order came in after 4 weeks, ITead’s came just 15 days after the order was made. The author however suspects it might have been a fluke, since all his earlier orders from ITead took around 4 weeks to complete too.
Seeed Studio vs ITead Studio PCB service head to head – [Link]