Hi Peter,
A few years ago a number of us used to swap systems with each other so a commercial system didnt cost us a zac.
It doesnt run now as most of us recognized that most were,nt worth a bumper.
However in amongst most of the fluff there was a gem or 2.
The one I found the best I still use with great results over many years.
Personally though I use the Don Scott ratings.
Many systems can be built around these ratings using Uselessbettors Data Base.

Cheers
darky