I'm glad I bought my 700x32 supremes last year. Got about 4000km on them now and they're still great. I just bought a set of 700x37 marathon XRs for my touring bike. The XRs are quite nice too. Not quite as lively as the supremes, but very tough and they grip really well. I'm a little skittish about riding my supremes on dirt roads and other rough surfaces especially with a heavy load, but I have no such qualms about the XRs. Now I feel like I can ride my touring bike anywhere.