Just popping up to say "me too".
I had somewhat wobbly/insensitive keys, so asked for a replacement keymap. It arrived within a working week, and I just installed it now. Problems are totally fixed and the keyboard now feels about as easy to type on as my Macbook. (Physically smaller so more accuracy needed, but key tactile experience is excellent.)
Observations:
1. Have a bright light to hand! (You're fiddling with black keycaps on a black rubber mat.) Also maybe a magnifier if you have middle-aged eyesight.
2. Follow the instructions to the letter.
3. Remember the ESC key will turn your device on or off! After removing it, push firmly on the key support to turn the machine off again. Then replace it last of all.
4. After replacing each key, press down on it firmly to ensure it's properly inserted.
5. Re-seating the return key and spacebar was easier than I expected (going by the instructions): just position with care, then press down gently, and the clips will re-attach to the wire supports with a positive click.
Oh, and (6) (which is why it took me a week or so to get around to it): ensure before starting that you have a clean, brightly lit, flat, CAT-FREE workspace!