I agree with some of the previous posts that short extensions aren't very comfortable, at least for extended periods of time. I guess it depends what your goals are and how much time you plan on spending on them. If you do group rides and want something to do a little faster pulls while you're at the front, those would be fine. For longer rides, I prefer something with a high level of adjustability, bigger pads, and the ability to bring the arm rests farther back than usual, so you can maintain your road riding position on the saddle. Otherwise you end up sliding forward too much and sitting on the nose of the saddle and your taint is not going to like that. Some extensions sets have the arm rest brackets that are independent from the bar mounts/clamps, such as some older Profile Design ones, or Pro Gear (the aluminum ones). If you have multiple bikes and plan on taking them on and off often I recommend Red Shift Sports ones. they have a quick release mechanism and you can get a separate set of clamps to put your second bike. You leave the clamps on the bars at all time and remove the extensions as needed. The advantage of that is that you don't have to get the position dialed in every time, they will always be in the same spot. Also the clamps are well engineered and are nice and wide so the chances of slipping are minimal. And trust me, that's an issue with some clamps. You don't want to over torque them (especially on carbon bars) but then you hit a bump and they slip and you end up with uneven extensions, which can drive you nuts. One thing that helps with that is a layer of sports tape around the bars. Oh, and contrary to what some may think, aero bars are great for gravel.