>>17
I find the quick reference to be very helpful when trying to get an overview over a group of functions or some topic like the type system, the loop macro, etc. As such I have it printed out next to my desk, in form of a A4/2 booklet. But eventually you have to fall back to the Hyperspec or something else (since at least to my knowledge SLIME cannot provide sensible online documentation), when having to deal with the details or edge-cases.