I had one and let it go cheap with a bundle. I guess I found it a bit Fisher Price if I'm honest compared to the A4000T keyboard or even a cheap AT keyboard from that time! But it fits in the A1000 keyboard bay so I know any A1000 owner would want it and it's mechanically a nice design. I probably should have kept it but you can never hoard everything.
The only ones I see now are all yellowed normally. Sad...