Astec123:
Sorry but I don't see the point of something like this when a £2-3 steel will do the best job around and give the best overall cut.
It's a mystery to me how a steel will sharpen a knife - it might well, with a bit of practice keep a well sharpened knife at or close to it's optimum sharpness, but it will still need a good bit of work with a stone or diamond sharpener to get it there in the first place, possibly even after a grinding to get the angles right!
Most steels people have are viciously coarse too, the idea behind it all is it should just hone the edge and remove small knicks keeping the edge as it was first sharpened.
I am dab hand with a steel, but I never was a true "star" with the initial sharpening, and that's even after years of working in Meat Inspection - it just takes natural ability and a lot of practice to do a good job quickly.
The type of sharpener in this post is a type I have tried before at home, and find the ceramic disc type a total waste of time, and went back to using a stone, and having all the mess and bother that entails. I have used diamond sharpeners, with some limited success, (still prefer an oilstone!) but the ONLY
gadget I have any sucess with is one of these:
http://www.amazon.co.uk/AnySharp-ANY.../dp/B001DXVL6K
NOT recommended for ultra expensive knives, as it takes a fair bit of metal off in the process, but it produces a decent edge, in seconds, most importantly in the hands of an UNSKILLED user, and will hold the edge when using a steel too, at least for a short while, although I generally don't bother and give it a stroke or two on the sharpener instead. Others in the household can use it too, so I am less likely to pull out a dangerously blunt knife now :-)
The only knife I have NOT found it too good with is an odd layered Damascus steel type chef's knife I acquired which is VERY hard, and just doesn't "cut" so well with the sharpener.