pretty much what i do it for. nothing else. i can get the fit i want with setback/straight/setward seatposts, adjusting saddle on clamp and various stem lengths.

if i have a frame that has a headtube that won't allow me to go as low as i want, and don't want to purchase a new frame, i've resorted to a 25 or 35 degree stem and then flip it down, so as to get a negative drop. it has a few drawbacks though...