Not sure where to post the ?, so I'll put it here, with apologies if I'm wrong. Can anyone tell me if the CD versions of GM service manuals being sold on Ebay are on the level? I'm talking about

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&rd=1&item=4517241977&category=43989

or

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&rd=1&item=4518833153&category=43989

These seem to be selling for a heck of a lot less than what Helms sells their CD manuals for, so I'm skeptical. Is there a catch here I don't see?

Sometimes people who sell these things do nothing more then scan the individual pages and compile them into a large Adobe PDF file and slap them on a CD. I have one for a quad I bought on eBay ... "most" of the pages were there, some missing and some out of order. Not the easiest to navigate/find what you're looking for ...but definately useful. I would much prefer a web-based system or a good ol' paper manual.