i converted my old MTB from flat bar to bullhorns. the bike was since wrecked in a crash, but i can answer your questions.




-Do you like to mount the brake levers inline (a la CX style) or hang them off the horns (TT style)?

i put reverse pull levers out on the horns TT-style. keep in mind that levers designed for flat bars won't fit on most bullhorns (different diameters).





-Do you find yourself spending more time with your hands on the 'horns' or on the flat section?

my hands were on the horns the VAST majority of the time. that's why i went with reverse pull levers, so my hands would be close to the levers.





-If you converted to bull horns, did you find that you needed to get a new stem to attain a proper fit for you?

i did need to get a shorter stem to get the fit right with bullhorns.




here are some pics of my bullhorn conversion (RIP buddy, i miss you):