About two years ago I bought a $400 Niterider Cyclone HID system. I've used it frequently but intermittently, only when my commute takes me off of the roads I know well, or if I am riding trails in the dark.
I have always kept the NIMH battery in a neoprene pouch, and have frankly babied the entire system, as it was such a big investment for me. Well, look at what I got for my trouble:
The cable has begun to separate from its housing where the cable enters the battery housing, a dangerous situation. I concluded that this is the result of either a design flaw or manufacturing defect, so I called Niterider to see about getting it repaired under warranty. DENIED. They need $20 for the repair (will likely charge me an additonal $6 to $8 for a replacement cable), plus it cost me about $10 to ship the thing back Priority Mail, plus I will have to wait several weeks to get the thing back.
The CSR was polite but not supportive. Niterider has its "policies". I have policies, too. One of them includes warning others when I feel as if I have been ripped off.
I will be going here for my next lighting investment. In my experience, Niterider makes inferior products, and doesn't stand behind design and manufacturing defects, even when such defects cause a potentially dangerous situation. I strongly suggest an alternative source for your lighting needs.