I have loads of the things, always trialling to find out what's going to be best bang for your buck. I have Petzl elite, petzl zipka, petzl tikka, cybalight by ring, Alpkit Gamma, Alpkit Viper and a streamlight and they're just the LED ones.
I liked the Gamma, but they did have a number of failures, my brothers and a number of others had a failure with the battery compartment (this I believe they have now resolved as an issue). On mine the outer sheath of the wires perished, this was however after over 5 years I would guess. The headtorch itself still works, it has multiple modes and various light colours (Green, Red and White), it's not the smallest of my headtorches, but I still like it. At £17 delivered with batteries it can only really be beaten by one other torch and that's it's new Little brother the Viper.
The Viper hasn't got so many lighting modes, but then if you want a torch not a tactical, signalling, tracking device and torch all in one then it's pretty much all you need it's smaller, not having a seperate battery pack and lighter. You still get various lighting modes, but without the colours and it costs £14 delivered with batteries. Now I've only had this one for around 6 months, but it's a good torch for the size and weight. It's an excellent torch when you take into account the cost.