A good introduction to whitewater for beginners or as a touring run: lots of small natural rapids and a few weirs. Bolham weir at the takeout is nasty: portage around on river right and then paddle across the river downstream of the weir to takeout by the road on river left.
Putin at Bridgetown, or you could shorten the trip by putting in at Exebridge. Takeout at Bolham weir, about 2km north of Tiverton along the A386.
Rainchasers is best experienced as an app.