Made the switch from stumpwm to dwm. Almost totally painless - dwm boots quicker, possibly switches focus even snappier (hard to call), but most importantly it actually has a useable floating window implementation, whereas stumpwm really seems to be not quite right in this respect.
stumpwm is more 'emacs-like', which I initially loved due to familiarity. It's also a lot better for initially experimenting to figure out the ideal set of keybindings. But two days after the switch my only feeling is happy to actually be able to run kicad, gimp, puredata & ardour seamlessly. All of these programs have major useability issues when the WM rigidly enforces tiling behaviour.