I'm thinking of switching to bullhorn/time trial handlebars mainly because I find myself rarely using the drops on my bike because the aero bars are more comfortable and efficient for me. First of all, does anyone use them, and what are your thoughts (hand positions etc.)? Second, can I use the same brifters that I'm using for my drops? Does it make sense to do so? Also, what are the sizes that are associated with these handlebars? Nashbar has sizes 40, 42, 44. Advice? Thanks.