I have tried C band on a commercial 1.2M dish and it is fine I suppose if you are extremely limited to one satellite and are willing to settle for a few channels and cannot get a bigger dish, and... Are willing to spend the countless hrs necessary over time to get the few channels you will get. ION channel grouping would be my choice if you do this.
then I tried a 5ft solid metal C Band someone gave me, with actuator and after many tweaking hrs it does work for everything except the new S2 channels. I do get REELZ though which is S2 on 91W and Bloomberg at the other end on 137W and everything in between that is standard.
the 5ft will be replaced with another 7.5ft mesh waiting in the wings when weather permits. I am one who would not recommend the effort unless you are willing to go the mile...
sorry to be so negative, but the effort is not really worth the results to me. Still, lots of us hobbyists do it.