Well if you had previous drop bar experience and had the fit dimensions you could see how the changes (and ending up in the same place as that previous drop bar fit had been) go then try to guess what the handling changes will be. Or just do it and ride the bike. With a frame which has flat bars the top tube is often a bit longer then a frame for a drop bar. But we're getting into a gray area, how you'll handle the greater drop to the bars, how the possibly longer reach works for you and what you'll think about the resulting handling of the bike. I doubt any one will be able to really predict your opinion after the changes have been made. Andy.