macweelzwrote a review of SwissStop FlashPro GHP 2 Brake Pads - Set of 4 on October 2, 2012
These replaced the stock Shimano pads I had and have done a great job, even with rims that are older and have a less-than-pristine surface. Manufacturing tolerances are good; during installation, they slipped easily (like they should) into the holders -- something that I've had problems with with other brands/brake combinations (I'm looking at you Avid).
Though part of the modulation comes from the brakes themselves, these pads have equalled, if not surpassed, that of the Shimanos. Dry stopping is excellent. Haven't had a chance to use them in the wet, yet, though expect good things as is typical from SwissStop. They are a touch softer than the stock pads, so we'll see how much longevity is affected.
All in all, a great replacement pad, if not a bit more pricey, for the Shimanos that come with your brakes. Four stars until I've had a chance to see if wet-stopping and longevity ding these pads for value.