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@andyp
They are brilliant for stopping, that's their core strength. What they weren't so good at was modulating speed, i.e. when feathering the brakes.
There is a total anorak article here;
http://www.campyonly.com/roadtests/delta.html
I've a pair in my bike bits box, waiting to go on the right frame. And I've two 3.5 mm allen keys.