I dunno man, my weber cali 15 isn't missing anything, it's probably the cleanest speaker I've ever played.
They're a little thicker on the bass, which gets accentuated with more gain, but that's just the nature of the beast. Personally I like it, a slightly slower movin cone is almost like a tube rectifier or something, it adds a little sag and sustain when you get it up there.
but no I don't see "metal" metal dudes usin em. That sag works great for any of the stonery sub-genres but it's not conducive to the super super tight mesa high-gain v30 superstrat thing.
Oh and the vader cab--look at that f-in frequency range-- 35 to 3.5? Are those even guitar speakers?