There was one left in store at my local Argos so I thought for £3 it's worth a punt. Now I haven't used it in anger yet (I've had the file out to reprofile the edge but not sharpened it as such) but here are my initial thoughts which are just my personal opinion;
Con's - I find it extremely top heavy so the balance and control is horrible - Graham, I'm not surprised your missus clonked herself with it.
I've got pretty big hands yet find the handle a bit thick and uncomfortable - that's just handling it, not actually using it so I imagine after a bit of continuous use it may be a bit of a nightmare. Please bear in mind that I'm comparing it to my Cegga which is perfectly balanced and costs something like 20 x the price.
Pro's - At £3 the worse you have is something to practice sharpening on and a turbo cheap back up chopper.
To conclude; you get what you pay for and £3 get's you this - if I'd have paid the £12 retail price I wouldn't be at all happy.