We just got back from a trip to CSR, it was our first trip there, we liked it. We stayed there because it was $400 cheaper than our favorite moderate Port Orleans Riverside. We had no problems with conventioners or buses or the size of the resort. Were not impressed with food court at CSR. We have stayed at Pop, it is the best of the value resorts, had no problems with buses or groups there either.
For $600 savings, I would certainly have considered swapping to Pop. Main pros for CSR would be larger rooms/beds, better main pool, more sit down dining options, and better landscaping.