I've got the Supernova V.3 led's in my Ram. I watched plenty of video's comparing the quality and light distribution before I made my decision. The design of the Supernova works very well with the Ram headlight housing and provides a very sharp cutoff, so they won't cause excessive glare. They advertise that the led's put out 1660 lumens per headlight at 23 feet, which is 30% brighter than the halogens, while maintaining the appropriate beam pattern and cutoff.
My experience has been that my field of vision is wider and brighter, but not substantially farther out. The white light makes it easier to see objects and react, as opposed to the yellow halogen bulb. I haven't had anyone highbeam me yet. I was following my wife to dinner the other night and she said that my lights looked great and didn't project any glare into her car at all, and she was driving a little Camry.
I think the most important thing to do is research led options in your specific vehicle. Different led modules react different depending upon the housing in which they are placed. Go to a vehicle specific forum and search for led's that other people have tried. Check beam patterns against a wall or garage. Don't get anything with a scattered beam pattern, only get something that mimics the halogen bulb pattern and provides a higher lumen rating.