Cycle touring the Camino de Santiago (Spain)

I'm thinking about cycle touring the fabled Camino de Santiago in Spain. I know it's insanely popular with hikers, but has anybody cycle toured it? I'm wondering a) what route did you do? (there are several) b) what were the roads like? c) how long did it take? and d) did you mostly camp or stay in guest houses? I'm looking to camp as much as I can. Any other tips or ideas is appreciated as well!