I just keep it there because it's so convenient to be able to route any old thing into either monitors or Sonar.
I've got a CD player, a Minidisc recorder & a Cassette Deck

all wired in, all ready for recording should the need
ever arise.
All my rack mounted stuff goes into it (POD/V-Amp/TLA 2100 etc) as well as three outboard synths and I've got various groups set up, the group outputs feed straight into the Saffire and into Sonar.
There's also a convoluted headphone set up which goes to the headphone amp.
I've only ever tracked a couple of bands live, and that was with my old Fostex D90's. We (me & the wife) only ever do our own stuff so there's never more than 2 of us recording. This might change 'cos I want to do a pub choir for a certain song.