I've had a black Mag Solitaire on my keychain for over five years (and so does my wife). Well, it used to be black anyways. It's mostly silver now since most of the finish has worn off. It definitely isn't the latest and greatest in light technology, but it has served me well for quite a few years. About once a year I take it completely apart, lube the threads and o-rings, apply contact treatment to both contacts, replace the spare bulb if it is missing, and replace the battery whether it needs it or not. It doesn't get used a lot, but I know it will always be there with it's dim little light if I need it.
I do have an Arc AAA on the way from Berkeley Point, and depending how much it impresses me compared to the venerable old Solitaire, I may finally replace it on my keychain.
On the second keychain I have for the car I only drive once a week or so (has a large "sentry" key and security remote that I don't want to always have in my pocket) I have a Photon Micro Light, and I'll be replacing my wife's Solitaire with another Photon too. I don't know if they will take the abuse the little Mag does though.
In my book, the Solitaire gets five stars (out of five) for its durability, reliability, and value (what are they now, $5. ?), but two stars for its dim little light output.
-Keith