I've had a chance to have a go with my three different McGizmo heads on the 2AA pack.
Pretty happy with it so far and it gives a different utility and handling compared to the CR123 pack, not necessarily better just different.
A couple of things to point out apart from the obvious differences in handling are the lanyard hole, I don't like it basically. I wouldn't use it for a start as I find the bridge section of the hole in the clip a perfectly good place to attach a lanyard if need be, secondly it's cut out quite roughly which doesn't go well with the generally excellent finish of McGizmo lights and it also only just fits design wise exposing half the height of the rubber boot retaining o-ring and meeting the top edge of the tail shroud where it slopes in on the inside.
I would prefer if it were machined out nice and smooth or better still not there at all but I can live with it.
Tail standing is fine on a good surface but due to the length and small base I wouldn't set it down tail standing as readily as a CR123 pack.
I'm liking the pack overall and the different handling it offers.
