We have purchased and have had modified the script you are referring to. 1. Installation was as promised.
2. Pricing for additonal mods was well within reason.
3. Customer service and support has been tus far second to none
4. The Pre-Deliver is working great along with every other feature in the system
5. If they do find a bug, the fix it immediatley and in most cases have released upgrades to fix issues we have never even come across.
6. They have a fully functional demo online with EVERY aspect of their script available for you to test drive - including an admin demo if you ask.

We have yet to see a full manual (and were in fact told none existed before we purchased) but we have yet to have ANY problem getting very clear and concise answers from the owner, who by the way, does not have an intimidating bone in his body (having met the man on several occasions for coffee).

The above sounds a lot like a BS post by a competitor if you ask me.