I love P4 for just working, but I absolutely can't stand the limited shelving ability. I ended up writing a helper program that lets me shuffle local changes off to a git repo just so I could manage working on several overlapping changelists. Perforce would be so much more usable if they would include this sort of basic functionality right out of the box. The thing git gets right is that you often need to juggle several threads of change at the same time, and those threads may have complex branching as you try out different approaches and combine the best pieces at the end.