Picked one up in Lidl yesterday. Great at recovering sharp edges that have gone past redemption with a sharpening stone - It has an aggressive wheel (and spare) so be gentle
This is a 65W model and I believe the almost identical items sell at £30+ from Silverline/Clake/Ozito.
Tried it with some HSS drills and some chisels and has brought them back to life.
Practice on some cheap knives before using it on your sushi knives as it is aggressive.