Treadmill speed change response time

Hi all. I’m considering a treadmill purchase for Zwift and would like your opinions on speed change response time. I’m particularly thinking of those workouts that require a spiked hard effort; say 20secs at 20km/h and the ability of the treadmill to change speed quickly enough to achieve this. I’ve been on a few gym treadmills that make this awkward or impossible. Any recommendations? For example is the Technogym Myrun any good for this?