I agree with you, and I have been using Vangrath's extender system for a while and the two look VERY similiar. Personally I would not spend any money on this pack without getting access to a "test" version, even Vangrath offers a 7 day trail version.
Buyer beware, I have a odd feeling about this "pack" since the functions are 99.9% identicle to Vangrath's release. As Mac said I would be interested to see somebody buy this and let a known developer have a go at seeing what this pack contains. :D
One thing I like about Vangrat's release is that you get the same package with all the above "custom" functions along with a working antibot system for $200.00 US.