How would you change the Jawbone Up?

Ordinarily, we'd be dismissive if you answered that question with "Doy, make it work!" but in the special case of the Jawbone Up, it's entirely apt. The wristband promised plenty of technological advances that would track your sleep, calories burned and diarize your food intake, all within the confines of a slender cord wrapped around your wrist. The downside? A significant proportion of the units conked out days after being opened, forcing the company to offer no-questions-asked refunds and halt production. So, what we want to know is: do you have a working Up? Does it still work? Do you like it? If Hosain Rahman was reading the comments below, how would you suggest he goes about fixing things?