I just finished soldering these into a Das Keyboard 4 last night. I have to agree with a lot of what's been said before. They're very tactile right at the top, considerably more so than Cherry browns, but then they just collapse. After typing on them for a while this morning, my silenced Topre Type Heaven feels almost linear. The box browns really have that much of a bump at the top. These are definitely quiet enough to have in the office. They're not quiet as Cherry browns with QMX Clips, but the travel isn't reduced as much, and the box browns obviously silence the upstroke and downstroke, regardless of the keycaps used. I can't say that about the QMX Clips. They don't silence the downstroke on far too many keycaps I've tried. For now, they're keepers, and I'm not instantly dying to replace them, which is how I felt about Cherry silent blacks on this same keyboard. The weight seems about perfect. The tactility will just take some getting used to. One thing I noticed is that these are easier to solder in crooked. It seems like the large alignment nub on the bottom of the switch is shallower than the one on Cherry switches, or possibly not quite as big in diameter. The zero key on the numeric keypad was crooked enough to make the stabilizer inserts bind, so I had to unsolder it and straighten it out. One Alt key is a little crooked, too, but maybe not enough to get me to disassemble the keyboard to correct it.