The only reason I said stay away from the corsair boards, is because they aren't full mechanical. I can't really comment on the build quality, because I've never used one. I'm sure they're pretty good considering they're made pretty entirely of aluminum.
And for me, there is just something I can't stand about the blackwidows. It's the way they feel, sound, and look. I hate the keycaps, and the chunkiness of it. typing on them, even HEARING somebody typing on one, makes me cringe almost. It's almost like a "nails on a chalkboard" effect for me. I really don't know why.
The blackwidow was my first mech. I hated it so much I gave it away for free and bought a filco. Then I went as far as to give the person I gave it away to a free Rosewill because I couldn't stand letting him use the blackwidow xD
I know, I know, That's a bit extreme.