Yup. Just got some Vittoria Latex tubes from Nashbar that two out of three mounted failed before being ridden--at all. I've seen similar reports on other forums. PRobably explains why they were on sale. In any case, it's pretty hard to show a tube is defective after mounting and mounting is a requirement to find out it is defective. The original catch-22. Tubes are cheap, live and learn.
Sometimes I buy new tubes, install them on my bike and then put my old one in the box and return it to the shop claiming I bought the wrong size.
I sincerely apologize for any inconvenience this may have caused those that subsequently purchased my used tubes.