The Planet Bike mudflaps look really good - I'd love a set, but no-one sells them in the UK and buying from the US would mean a ridiculous cost for postage
Here's something to bear in mind about the Planet Bike Cascadia fenders: They shorten the fender before adding the mudflaps. This defeats the purpose of a long mudflap.
I have SKS P-series fenders and PB Cascadias. The SKS fenders without mudflaps are exactly the same length as the Cascadias with mudflaps. The ideal would be an SKS fender with a Cascadia mudflap.
I had wondered about this actually, why would they shorten the mudflaps? Seems a really odd thing to do, given that ground clearance shouldn't be a problem in any case...