I picked this light up @ Nashbar a couple of months ago and so far am pretty happy with my purchase.
Moon and Serfas market almost identical light products and comparing the Moon Sport 780 to the Serfas 750 at my lbs revealed no performance (beam pattern and light intensity) differences and a couple of physical/accessory differences (appearance in favor of the 780 IMO, different mount and an additional wide angle optic and usb wall charger in favor of the Serfas). Checking out the Serfas 750 results in the MTBR 2014 light shootout should give you a good representation of beam shots and expert comments on this light. So why should you buy this light over the serfas or any other approx. 700 lumen self contained light, PRICE. I paid < $80 for mine and I notices today they're marked @ 79.99 and you can get 20% off any single item @ Nashbar. So for $63.99 + shipping you get an excellent light (according to MTBR and my experience), and while not as cheap as an Asian clone you get a warranty and Nashbar to stand behind your purchase. Sounds like a good deal to me.
Mtbr's 2016 Winter Biking GearReviews and Roundups
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Thread: Moon Sport XP780