It appears that little PA01 uses the same emitter as my BC20. So it should be pretty potent. The only downsides I see are that the single AA won't have as good a run time, plus it costs the exact same as mine (with 2 x CR123A cells).

Of course, if you need something smaller than the BC20 it looks great! I'll probably pick up a couple more JETBeam lights over time. I'm also planning to pick up that little Fenix that uses 1 x AAA.