Firefox,

I'd give my vote to the 1.5mm ones. I don't know if others feel the same, but I personally do not like much trasparent buttons because, at least in picture, they look a bit to... visible, to me. They almost make the display "disappear", while I really like the way it looks at night, surrounded by... nothing (I'll still buy transparent buttons of all colors because I am an empeg collector, of course, but that's another story... ).

The 1.5mm sample looks just beautiful to me. They are elegant, tell you where the keys are, do not "disturb". Of course, just my personal opinion.

I really can't wait to buy metal buttons. And now I am finally seriously considering to have my empeg modified to add button lighting.
Thank you very much!