I find that the little one that Rob picked are much better than the old school orange ones. The orange ones based on an incandescent bulb, if you leave standard AA non-lithium batteries in them they tended to corrode and fail after just a couple of seasons. The one Rob picked is LED based, are brighter have a very long run time. For my $0.02 would go with current technology, it's smaller (less likely to get hung up on things in rescues) and works much better. The gaskets on the ones I received were your normal O rings just like the ones in the orange AA based strobes. The ones I picked up last year have a more secure clip than the picture in his link, hopefully the picture is wrong and that they didn't change the mount.