I've only used an early version of TyTool but I think they're pretty similar in installation and operation. You have to install a server on the Tivo to do the indexing and streaming of the MFS streams and you get a utility to run on your PC that does the rest. Actually using the utility on the PC is similar according to the forums.

To be honest, I usually don't extract stuff off the Tivo. Most of the stuff I record isn't particularly important and if I run out of space then I just delete older stuff even if I haven't watched it.