I had HID's installed soon after we purchased the RGC. The light is fantastic. Without projectors built for them, the lights kind of lit up the world, rather than being focused out on the road ahead. Different than what I was used to, not distracting - and great light.
I bought the LED's when they came out and have been happy with them. They are very bright, but seem more focused down the road. There is a flat cutoff that takes some getting used to. I notice it mostly when leaning into a corner at speed.
I don't regret the decision to go LED - but the HID's were a cost effective solution that worked perfectly.
His - 2012 RGC, Vivid Black, Bassani RR II 2>1 exhaust, Ohlins, Traxxion, SE breather, Dyno Tuned, JL audio
Hers - 2013 Deluxe, Birch White / Sunglow Red.