I have been using two of them quite a bit. No problem with reliability. I found on ebay, LED bulb replacements. Definitely took them up a notch in brightness.
Thanks guys. The bulb isn't too bad for light but an LED would be an improvement. This one seems to work just like pen lights did when I was a kid, you have to fiddle with it to get it going. Penn State now has a LED version that I would buy in the future.