Just tried this tonight and wow....
Scrub and pierce spuds, put on the rack with a cup of water in the bottom, and set on high pressure of 20 mins (4 large spuds), natural release.
Lovely fluffy dry spuds. No crunchy skin but I suppose you could grill them for a few mins. I normally microwave for 8 mins then skewer and bake for 25, but this has meant I didn't need to turn on my oven. I'm mad it took me so long to think of it.