I bought one about this time last year and used it though the winter. I did tape the battery up before I used it and I have a big velcro strap (It's an L&M one) to secure the battery. I use the smaller O ring to mount it on my oversize bars as it's tighter.
Sometimes the switch acts a bit random but otherwise it's been absolutely fine.
I did an overnight ride and borrowed a spare battery for it, but using it maily on low beam, and turning off when stopped, it lasted all night on one charge. I reckon I got a good 7 hours out of the battery, so 2hrs more than it should last. I was trying to time it to see how long it would last but gave up becasue I got bored. It might have been 8hrs + I dunno really!
To be brutally honest, I honestly can't see why anyone bothers spending any more. I sold my £300 Lumi HID for £125, and bought the DX. I reckon it's about the same power as the Lumi, with a slightly better (wider) beam pattern. Not bright enough? Get 2!
If it packs up, I'll just get another, but I see no reason it won't do another winter. £25 a year? Get in! 🙂