I've got a couple of years on my Dinotte 600L headlight and 140L taillight. A few comments on the Dinotte lights vs. some of the other solutions:
1. I also use my 600L for night time Mountain Biking. I've crashed with the light on my helmet, had it knocked off the helmet going under branches, etc. and this light has taken all the abuse, plus two wet Seatle wintertime commutes and just keeps working.
2. If you get the Li battery version of the Dinottes, you can use the same battery to power all your lights. My 600L came with two batteries which is really sweet - I can have one charging while I am using the other one. Dinotte makes a Y cable and extension cables that makes it easy to power all your lights from a single battery.
3. Some of my friends have purchased the cheaper lights and they always seem to be fiddling with them...especially the connectors. On the Li Dinotte lights, to connector system is foolproof and solid.
Sorry to be such a Dinotte Fanboy, but they have served me well.