For under £3 it's very good.,
This review is from: Stagg SCPM-C Curved Metal Capo for Electric and Accoustic Guitars (Electronics)
Bought this as I don't play the guitar enough to warrant a purchase of an expensive capo. It does exactly what it says on the tin, and I have used it on the second and fourth frets and so far it has held all the strings in place and tightly. The delivery was also quick and it came well packaged.
One minor inconvenience is that sometimes you have to readjust it to make sure it is pressing down on all six strings, but for under £3 I can't really complain. It does what it says on the tin, and it does it well!