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I bought one a month ago, after the cable broke on my RedEye due to prolonged use in extremely low temps - plastic cracked when brittle.
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The TraceR is 2 inches long and an inch in diameter at the widest part. It clips in and out of a seatpost mounted bracket. There are 3 intensities and you can have solid or flashing mode in each. I find solid on the middle setting to be adequate for road commuting and gets me to the middle/end of the week before needing a recharge (6+ hours).
There is an indicator built in which lets you know the charge level. If low, I just take up to my office and plug it into my phone charger.The USB charging cable is the [b]same used for Android and Nokia Lumia phones.[/b] One less cable at work for me 🙂
I'd like to be able to purchase another bracket or two so I could use the one light on other bikes. Good for the money I reckon - £45.
Concern would be with the [b]longevity of the rubber band [/b]which covers the charge port and the on/off button. Time will tell!