Never owned one, and not sure how long the bulbs last, but the HIDs seem to have very high prices for replacement bulbs.
The Magicshine appears to be a best buy for LED lights and things such as the battery pack are much more reasonably priced than replacement packs I have priced for the name brand lights.
__________________
Gear Hubs Owned: Rohloff disc brake, SRAM iM9 disc brake, SRAM P5 freewheel, Sachs Torpedo 3 speed freewheel, NuVinci CVT, Shimano Alfine SG S-501, Sturmey Archer S5-2 Alloy. Other: 83 Colnago Super Record, Univega Via De Oro
Visit and join the Yahoo Geared Hub Bikes group for support and links.
http://groups.yahoo.com/group/Geared_hub_bikes/