Really, really good.  They are how I lost my Filco MJ1 to my better half.
"Here, try this one"
"Oooo.  It feels so good on my fingertips."
Excellent.  Take the keyboard I will have to replace via the UK and the keycaps I had to wait for a month to get from China -- and that I've had for a week -- and are out of production now.  <sigh>
PM to Imsto...
Really nice keycaps.  Worth the money and the wait.
 - Ron | samwisekoi