Continuously updated zpool iostat
cmdwatch -n 1 zpool iostat -vy 1 1
For example, cmdwatch -n 1 zpool iostat -vy 1 1 will give us the detailed output from the last section, in an updated in-place format on the screen rather than scrolling. For truly interactive use, this is the superior way to check iostat on an ongoing basis.
The only real disadvantage to using watch or cmdwatch to monitor zpool iostat in realtime is that when you ctrl-C out of its loop, it clears the screen one last time, rather than leaving the last set of numbers visible. This is a problem if you need to capture the output.