I'll piggyback onto what KillerVRod says (since I have his Daymaker adapter on my F).
I like the Eagle Gen-III halo. Far, far better than stock- and the halo is certainly attention getting (especially in the daytime). However, I think that (at least in my experience) a good HID (like socalmotogear) in the stock housing may be slightly better in beam coverage-- the Eagle tends to be a bit "spotty" at longer range since it has individual beam elements instead of a reflected beam.
Additionally, I've experimented with the high-end halogen's (Hoen XenonMatch) at some length. While plug and play, they were a great idea right up until the LED's and HID's got sorted out. I'd recommend one of those two ways going forward now.
It's all a matter of trade-off's-- the HID has a cleaner beam pattern, but you have to worry about beam cut-off for other drivers, finding room to mount the ballasts (topless is your friend here), etc. The LED is more or less plug and play, and is certainly a LOT easier. The halogen's are a small improvement, but they tend to burn out quickly and don't provide a huge increase in brightness.
IF I had a "classic" V-Rod, I'd upgrade to the "drop-in" LED (the one shaped like the stock teardrop housing) as a minimum. Because, let's face it-- a guttering tallow candle from 100 years ago is better than the stock lighting that H-D came up with.
And fwiw? I've looked at my Eagle Halo light, and I've looked some high-res pictures of the Chinese version of the Halo-- and if there are any differences, they've got to be internal-- same specs, same housing, same wiring. So, there's that variable as well.
If nothing else, Eagle and Hoglightz (the Australian guys?) are a known quantity and stand behind their products, providing tech support and questions answered as required-- that's worth something in my book. KillerVRod's mount? Simply awesome.
So, overall, I'm glad I went with KillerVRod's mount and the Eagle Gen-III (NOT the Gen-II)-- cleaner install, 90-95% of the brightness of the HID, and a different and interesting look on my bike-- day or night.
Just food for thought.
R.