I have 4 at the moment, a Genos, a Tyros 5, an S975 and a PSR 47!
Eh....EDIT! I have 5! I forgot my beloved PSR-2100. When you loose track its too many
The PSR 47 I had for 13 years before upgrading to the PSR 2100. That I had for 14 years before I upgraded to the PSR S970. It broke, so I got the 975 as a replacement. I had to wait a long time for it, so in the meantime I stumbled upon a Tyros5 in very good condition. I was afraid I could not use the touch screen of the Genos due to low vision, and was decided on sticking with the Tyros. But, after trying the Genos several times in our store, I discovered that I could use it and broke down and bought it three months ago. Did I need it? No. Do I enjoy it? YES! Amd being Toril, a hopeless collector, I am not so sure I ever will have the heart to sell my beautiful Tyros. BUT, if I ever by another model, one will have to go, my apartment is FULL!