The actual 10/90 times are measured on the bottom: 1.88 and 2.44.
Followers need high-swing, fast drivers, which just moves the problem upstream. I have used RF PNPs driving mesfet followers (CLY2 sorts of things) to get numbers like 12 volts rise in 400 ps. But the turnoff edges are ghastly.
What really rocks is GaN fets. The transconductances and capacitances are amazing. So are the prices.
Me too!
John