By all reports, both lights are of very good quality. What tips the balance strongly to the photon side to me is that 1. the photon is a good deal smaller, and 2. The photon has user-replaceable batteries. User-replaceable batteries are an absolute must for me. Since this light is on my keychain, I use it a lot. Long life or no long life, I end up having to replace the batteries at least once a year, sometimes twice. Having to take my ASP, find a box, figure out ASP's address, wait in line at the post office, and send it off to get the battery changes, then wait a couple of weeks before I get it back, is simply not an acceptable procedure. I know exactly what would happen with me: after the batteries burned out, the light would lie around until it got lost, and that would be that.
Joe