In reply to sutty:
The Myo series are fairly new, so I don't have much long-term feedback on them yet. As far as I know, there have been no problems with any connections yet (unlike those ghastly connectors in the Zoom!).
Personally, I use Duos (upgraded to the 8 and 5 LED variants) for nasty conditions and anywhere I need a decent beam. I've yet to have any problems with any of the electronics (I use Duos for lighting underground too, so mine have had a fair kicking); the only moan is the halogen bulb: with repeated bashing, it can work loose. This shouldn't be a problem with Myo as it has a more sensible means of fixing the bulb in place (I think).
The Zipka Plus/Tikka Plus mentioned elsewhere are stonking gear if you don't ever need a long-distance beam; they're so small and light, you can pretty much have one with you at all times. For general stuff, that's what I use and still carry one as a back-up even if I'm using Duo (at least, above ground; they're not water-resistant enough for underground, IMO). Excellent for a bit of light to change a tyre by at night too...!