I have a Matias Quiet Pro keyboard with Olivetti keycaps with some problems: 1) There's a problem with the numpad. I left the switches unsoldered in the numpad, even if you solder the switches in, there's one key in the numpad that's ghosting, it shows up as an input in windows but it doesn't put anything out. 2) The insert key doesn't register 3) There's only one USB-pass through instead of three (the side-USB pass throughs are missing). Other than that, the letters, non-numpad numbers, function row, navigation cluster except the "Insert" key work perfect. - Here's a diagram of what keys work in green and the keys that don't work in grey:
http://imgur.com/9CFVuTI - Timestamp:
http://imgur.com/l9oBnTDisclaimer: I don't need exactly 120x, I just need enough switches for a full sized keyboard and a little extra.