After buying and couple of these and a couple of the other style I like the other ones better.
These aren't as strong and don't protect the fragile tritium vial as well and I've had 2 vials break.
The other style if you buy 3 3 dollar kit with it has the tritium vial inside a piece of protective clear plastic and still glows just as well if not better and I haven't had any breakage.
I think these are ok for light use, but they bend to easy for anything stressful like being banged around in your pocket or hanging on a lanyard.
Hope they do another drop on the original style soon!