I have used Chainsaw once before, in fact I bought the exact same thing you`re thinking of getting. I had no problems whatsoever, except that you can`t pay on the site so I had to fax him my card details. Came within a week.
The quality of the discs isn`t upto much, but it`s certainly the best package around at the moment, although Anchor Bay are supposed to be doing a 3-disc set (Theatrical cut, Romero`s cut & Argento`s cut) sometime in the next year or two. Also, the documentary on the DFW version is brilliant.
Good luck,
Chris.