Why, Alaric Darconville, I do declare you're asking me to make a subjective statement! If I am indeed being provided that leeway I will oblige.
I found the light from the HID to be more intense but primarily more usable. This was especially noticable on the dipped beam where the light distribution seems vastly superior to the halogen buckets. Prior to installing the HIDs I actually did not feel safe driving this truck at night.
/subj
WRT cost, I purchased the complete OEM lamp assemblies from an online vendor for around $700. With gentle guidance from Scheinwerferman I avoided the temptation to 'upgrade' any part of the lamp and left them straight stock. A well-made wiring harness (Morimoto relay though) from another online vendor was another $100 or so. The performance is such that I no longer consider adding any auxilliary lighting to the vehicle.
So no they weren't cheap. But it's a $50K truck. I would have ordered it with HIDs were they available at the time. Ultimately, I get serious quickly when the safety of my fiancee and myself is in question, or even the middle aged dimwit who skateboards down our street at night, and have no problem breaking out the big boy money.
Cheers,
Rick