Footlocking double rope is about all I use it for.
I love the Blakes hitch, uses the same size dia rope as your climbing line, use the tail of your climbing line! Doesn't need much tending, make split tails from normal climbing line, doesn't bind up, easy to tie and it's a nice big fat knot that's easy to find and grip ... slides really well, I really think for climbing it can't be beaten.