I dont have any prices yet ... when I do I'll let you know.
The XT3s are bright little lights (brighter than Whelans TIR3s) and so I have no problems in saying that the XT6s will be good.
The XT series of LEDs are great from an installation point of view. Dual voltage 12/24v, built in flasher, sync wire to sync with other heads, compact, flush mount kit available.
I have also seen them fitted inside Lomax lightbars ... look good