I love the shape of the ASP lights, and how light they are. I bought about 6, and hung them on coats, bags, keyrings and various other items for use out and about. In less than six months, every single one of them was out of service, mostly because the little clip at the end had broken off, or the light had completely broken into a dozen pieces, scattered across the road. (it's really embarrasing having to ask for a light to find the pieces of your flashlight which has just spontaneously disintegrated - never did find the LED from that one).
Anyway, after killing $75 in ASP lights, I tossed them into an envelope for warranty replacement, but never got around to sending it in.
Just for reference, none of this was in hard-use conditions - mostly going back and forth to my Master's degree location in my car - the many rigors of a school bag, keys and coat that went from closet to car to classroom and back.
For another $70, I bought three ArcAAA's, and an Inova MicroLight and they've all now survived almost two years with no ill effects.
The ASP design is remarkably fragile - I used to love it, but now can't be bothered to send in the envelope to get six free new ones. I literally won't take one for free.
ArcAAA is the hands-down winner for function - it's amazing how much more willing I am to actually USE a light that has an easily-replacable battery. That said, my Inova Microlight lives on my keychain, because I really like the smaller size, and if my keys get any bulkier, they won't fit into my pockets any more.