I'll be interested in what everyone has to say. I installed LED headlights on my '72 a few years ago. I bought the kit at a local auto parts store, name brand and everything, and have been hugely disappointed. It included everything from the ballast to the bulbs to the reflectors and lenses. They are certainly bright, but they have way too much scatter and no cutoff. The high beams are not really usably brighter nor further reaching than the low beams, just even more scattered. I would love to find a set that is as focused as a set of proper H4's.
On kind of an unexpected side note, I learned while driving into Klamath Falls last year in a near blizzard that these things, since they don't get hot, they don't melt snow. My "sugar scoops" filled up with snow and ice, rendering my headlights somewhat useless. I would have never even thought of that, until it happened.