while the plastic T6 has been fine for me, as I read other people's experiences it's not a very robust light. So reading your responses I've made some changes.
If you want something heavy duty I recommend the Brinyte DIV05. Which I did a review of Here.
I just got it back from the laser engraver. Here's what she did...
my dive buddy's last name is on the other side. This one is a Christmas gift so I have to get another.
I ordered another one from this place. The seller assures me that it's a Brinyte DIV05 (see Description) even though there's some errors on the site.