I've only been at this about 2 1/2 months, and I'll just tell you what my trainer told me, which is much the same thing everyone else has said: real food is always better than supplements.
That said, I use 3 shakes a day, but I'm using gainers. Initially, I was doing 2-3 protein/mr shakes a day. At work, it's tough to eat in the morning and in the afternoon, so the shakes are a Godsend. I use the Optimum PowerMass 1000 gainer, and the Optimum 100% Whey protein for a low carb.
My strength gains have been steadily increasing from the beginning, and the results are getting more visible. There wasn't much to see (for me, anyway) in terms of results after 1 month.