My bike is unstable when I sprint in the drops but bullhorns, with a really steep slopping stem, sprint fine. And ya, being able to adjust them stem while riding would be really nice - like a button or something.
Anyways I think i'm going to buy the ritchey pro adjustable stem because I think that's a good name and it's like 50 bucks. I'm pretty sure I could probably never afford that Look stem.