I haven't looked at them but can i suggest a couple of questions to ask yourself.

1. Why are you buying the system?
2. Are you going to bet every selection it throws up ? or will you give up after the first big drawdown.
3. Are you capitalised adequately to bet the systems correctly.
4. Do you have the time to run the system every day (or on the days it stipulates).


Even if your happy with all these answers I would say the following...

There are quite a few good systems posted in this forum that work long term. Look around and paper trade them for a while. You lose nothing that way and you gain confidence in the selection method. Maybe you can improve it. If you have helped construct a system you will have a lot more confidence in using it.

Personally I think your better buying a database from a commercial provider and coming up with your own systems then buying a system from a commercial provider.