I clean mine after a ride and the crud usually comes out quickly, I can't say that I've ever had a problem. If it's left to dry then it gets difficult and needs the old toothbrush and hot water to clear. I have just checked mine again and one set are "blued" whereas the other set are standard aluminium.
Also I've seen comments on the internet about the lack of changing steps/pins/teeth on the chain rings, but I have never had a problem and get clean shifts without the need for the changing steps/pins/teeth. I just make sure my front mech is adjusted correctly.
Anyone else had a problem with them?
No matter how bad it gets... it could always be worse.
1996 Orange E3 - A601
1996 Orange P7 - A602
Repairs: All the various bikes of my 4 children and various nephews and sons of friends, etc. - Just give me the cape and call me "Bicycle Repair-Man"...