The Box White and Thick Gold speed switches have a dual-click design; they click on the way down and on the way back up. Both are very loud, high-pitched clicks, so if you like making lots of noise when you type, these switches are definitely for you.
I tested all four Box switches with a number of different keycaps from SP and they all attached just fine. Overall performance is impossible for me to assess without being able to type on a full board of them. The Box red, black, and brown switches don't seem much different to me than Cherry MXs of the same colors, but again, I only have individual switches to test, so a more accurate comparison is hard for me to make.
My favorite, by far, is the Copper speed switch. The Gold isn't bad; it has a soft, subtle click that is almost pleasant. But Copper still rules the roost as far as I'm concerned.