This is indeed an excellent upgrade. It makes your Model M compatible with the latest connectivity standards. It’s also programmable. Installation is very easy and there is a 3D printed holder replacement. It works with both membrane types - old IBM with three connector and newer Lexmark with two connectors.

I really like it, faster delivery!

Used for a few months, one tilted rotated thingie legs broke - had to scoop out plastic remains from button socket
Default keycaps vere very loose, my custom ones were ok tho

I have tried a number of low profile switches and migrated to Purplz and Red Pros, since I like the feel of linear switches. However, these switches are a little scratchy and noisy compared to the box silent MX switches I used to use.

The ambient switches are smooth and very quiet. I have wireless and a wired ferris sweep, and I will never use anything else moving forward unless someone comes out with a switch that is even smoother and quieter.

Great keyboard came with a case and works perfect, it has frimware already loaded so works out of the box, just needs switches and keycaps

Great product! Very easy to install. If using QMK firmware & QMK toolbox to customize, toggle the auto-flash checkbox and plug in the keyboard via USB. The modelH runs the bootloader for a second or two after connecting, so firmware updates are super easy. I may pick up another one for my M 122.

Great switch. Very smooth and quiet.

Enough cupping but not too much. I like the subtle ridge on the guide keys.

Product page and site are very good at making sure you get everything you need.

Make sure to pay attention to controller positioning during assembly. Instructions are a bit vague, but the silkscreen printing on the board specifies correct position.

First time I did SMD soldering and everything turned out great.

I recommend rp2040 controllers qnd qmk for first timers.

Quick delivery, quality Contra pcb kit arrived in about 9 days from ordering . Pleasantly surprised at how quickly it was delivered. Making Raspberry Pi Portable PI 80.

Typing with my sofle choc now! This is my first split kb and first build. I have some electrical engineering background so soldering went really smoothly. A couple little little easily-fixable soldering mistakes. On a standard keyboard I can get about 110 wpm. After a few days, I was crossing the 80 threshold on this! A few days later averaging around 85wpm.

I bought the Helios rp2040 uC, and have been using custom qmk code/build. However, compiling code yourself isn't needed, because Keebd very nicely supplies pre-built binaries for this board which is the easiest way to get up and running (How To Guides > Firmware Files). In my custom firmware I've implemented (copied someone else's code) Windows and Mac mode, so I can use one key combination for undo, cut, copy, paste, home, end, next word, prev word. Depending on the current mode it'll send the right key codes to the OS. It's going to be a game changer for someone who regularly switches between Linux, Mac and Windows!

Remember: under-key RGB LEDs don't come with the kit, probably because it's not a necessity. However, I skipped over this detail and had to wait another week to get my LEDs in. Also female pin standoffs don't come in the kit for the microcontroller or the OLED. Remember to buy those if you want it hot-swappable.

I'm not currently using the acrylic base plate, because I like the minimal low profile of the kb. The short TRRS cable that comes with the kit is super nice and high quality! I just wish it was a foot longer so I could separate my halves to shoulder-width.

I bought MBK Glow R2 keycaps and am using Choc Silver switches. So far the combo is nice, but I actually would like a slightly louder keyboard. In a quiet room, it's still got a pretty satisfying sound however. Silvers are pretty lightweight, so sometimes I mistype when I didn't even think I pressed the key down, but this will get better as I learn.

If you're interested in improving your touchtyping skills, check out entertrained! A website where you can practice typing and read classic public domain books!

There's not a lot of range in the chocs, but these go nicely.

Thank you so very much for your honestly incredible service.

The kit arrived in perfect condition, and with all parts, +2 extra diodes, which ended up being a blessing, broke a diode in half, I'm assuming, thanks to the fact I got the iron too close to it while installing the hot-swap sockets, the kit can't solder itself for you, but for everything else, it was great.

No complains from me, works very well, forgot to buy the pins, but the diode legs saved my build.