I'm just getting back into betting and systems, but remember that the Dark Horse and Hot Pots systems were well thought of a few years back, does anyone know how they have fared with the test of time?

no popular system stands the test of time, cause if it goes well for a reasonable period and people know about it, the dividends crash and profits are not possible.

The only type of system that will work is one that you develop yourself and keep to yourself and only bet on the horses it selects that are "overs".