I agree with all the comments made above.
They're single pivot brakes which give the advantage of less weight, with the Swiss stop brakes pads you get good stopping power too. Centring them is a pain and pretty much you need to check them before each ride and if you stick the bike in the back of the car then you'll have to set them up all over again.
I liked them to start with until after about a year I got pissed off with the constant adjustment and bought a new pair of Miche dual pivot brakes carbon. More weight but the relief of not having to constantly re-align them, more than makes up for that.
Has anyone used these and if so any issues? are they any good?