Another vote here for more conventional bar ends mounted inboard of the grips. With your standard flat bar grips, if you try to get low/aero, your elbows end up sticking way out. Since your hands are already pretty far apart, you don't really want your elbows out any farther. That leads to pain and discomfort, and kind of defeats the whole purpose of getting low anyway. Also when I had my bar ends out at the ends of the bars, I was barely using them as again, I didn't want to place my hands even farther out (and farther from the brake levers and shifters) than they were on the regular grips.

So I moved my bar ends inboard of the grips, and now I LOVE the setup. Having something vertical to grip on lets your elbows drop down instead of out, which lets you get low and more aero, and IMHO is more comfortable than having your hands farther apart. I even use them when not trying to get aero. Also their placement lets me easily put my last two fingers on the brake levers if needed, or pull the smaller shift lever, with barely any or just very little hand movement.