Hi my model 01 has keychatter on the right half on the key you press with the middle finger on the home row. So I once a week have to hold the keyboard upside down and press the key several times.
The other issue since today is that bksp/del key does not work anymore. I started the matrix key test with LED, left Fun and PROG. The key is the only one to not light up.
I did carry the keyboard twice to work with the case but otherwise it is just sitting on my desk since I bought it.