SK-8855 (https://sharktastica.co.uk/wiki?id=lenovo8855) is my biggest productivity tool. I'm probably about twice as productive with this keyboard than without it.

They resell for $150+ on ebay. I dread the day when my supply runs out.

I'm typing this comment on a T60 keyboard, transplanted into a T500.

IIRC, Lenovo was manufacturing the T60 for IBM, but, by Lenovo T500 time, they seemed to be skimping on the keyboard backing, causing it to flex.

Old school Think pads had the best keyboards.