I have got some multi-track drum sample libraries and they would be a great addition to the tool bag
However, like SF I usually get drawn to my drum VSTs to create my own beats or use a standard loop and mangle it if there is something particular I want (eg eq out all the low end if I don't want the kick)
With the multi-track samples you have to mix the drum kit, which is great fun but can be quite time consuming - although I think you do still get a full kit mix
If you want to work quickly I would suggest looking at loop "construction kits" where you get different versions of the same loop with elements added and taken away