I would say no,
The good (W and X) bins are, at present, unobtainium. A lot of folks have moved to the Luxeon III for throw and they can be had with good bins. Why get a U bin 5 watter when a T bin is much cheaper and almost as bright? To say nothing of the fact that the T bin is rated at 700mA, they could possibly hit U bin at 1000mA.
BilBill, the Luxeon III has better throw than a 5 watter due to the single emitter size VS the 4X larger die of the Luxeon V.