In reply to Spagnal2012:
I've been carrying and using the Petzl Actik Core for a few years now and have found it to provide plenty of light whenever I've needed it to. It gets used most weeks, often by my partner who likes night walks with some of her friends, so it's gone through plenty of recharging cycles and shown no apparent drop in performance. It often gets used at below 0C and works just as well as at higher temps, although I've probably never tried it when it's been colder than -10C. It's not got a great waterproof rating, but I've used it in the rain a fair few times with no problems.
It has a limited number of light levels, but I like that. No phone apps or complex series of button presses are required. It also has a simple lockout function, which I reckon is just about essential.
I'm sure there are brighter, tougher and more technologically sophisticated torches around, but I've not been tempted to spend the cash required to get one.