I've had them on the bike for about a week and over 400 miles and have no regrets purchasing the HeliBars. The bike feels more responsive and more comfortable now that I can place the grips where I want them. U-turns while 2-up are much easier now than with the stock setup. My only gripe would be that it seems like you can only move the grips up and forward, or back and down, because of the way the adjustable pivot points rotate.
Self-installation went rather smoothly. The left handlebar does take some time to get off using the tool they provide, but it wasn't difficult, just tedious. I'd rather take the time to do it right than damage the heated grips. The provided instructions and photos, while not particularly awesome, were sufficient to help get the task done with a minimum of uncertainty. Bleeding the brake lines was also hassle free thanks to the bleeder valves they've included - genius!