I have the Dual Explorer NiCad (10W,15W,25W) bought last September. Very happy with it, I've used it in cold nights down to 25F with no problems. The switch went bad on me last month, but I sent it back to CygoLite for a repair under warranty, and now works just fine.
Performance wise, is very powerful and bright, even at 10W, which is enough for most road conditions.
Corsaire