I've had one of these on my large "key"-ring for at least a couple of months now, and it has stood up well.

I'd second the points made in the review above... this pen was exactly what I was looking for in terms of function, and (in full-size mode) is much better to write with than a bullet-pen. Most importantly, you get to feel like James Bond when assembling it.

I also don't see the point in paying that much for the Ti version, unless you really prefer the appearance.

eeph