Hi Jose
I purchased Dark Horse and Utlimate Dark Horse in the dim past....Followed for long time but without success. Blew the dust off about two years ago for a short period without success.
I think with most systems if you are lucky enough you may start betting at the start of a winning sequence however it is the long term where most fail.
Anyway if you say they are winners I will just have to try again maybe.
There may be a light at the end of the tunnel after all but take a torch with you just in case.

Good Luck Midas