noglider 

It's hard to express. It rarely seems to make sense to spend a lot more than what others spend to get what appears to be the same functionality. But when you get a dynamo setup, you realize that you got all of your money's worth. That's why so many of us wish we had done it sooner, and that includes me. On the one hand, you can develop a perfectly good habit of keeping your battery charged. You can become skilled at putting on and taking off your lights as needed. And it works. But once you can stop doing all that and can ride knowing your lights will work 99.9% of the time, you get a new feeling of freedom.