Pros: Incredibly bright light. And very efficient -- at 25W (25V, 1A) it just gets warm without a heatsink. At 100W it's enough with a small (15C/W or so) heatsink.
Easy to mount (I used pop rivets -- the 3.4mm mounting holes are just perfect for that) solder and connect.
Cons: None that I can think of!
I bought four of those and four of the 6300K version (155708) and connected them all eight in series to 220V AC rectified (plus some filtering and current limiting) after an SCR dimmer and got myself an 800W greenhouse lamp that otherwise would cost $1,000 or so, for less than $100.
Thank you, DealExtreme, you really are extreme when it comes to consumer electronics.
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