I've never required a Tirfor in nearly 10 years....6 of that doing stuff much more "hardcore" than most on this board, always been able to self recover;)
Like Damien said, the best option is a second hand high mount, they're much more basic in design and a much more reliable winch than a low mount:)
Also righted a few that have done a blackboard impersonation..."upside down, upside down"

