No, I subscribed a week ago to see if 4 is better than 3.5 with regard to generating C/C++ code. 4 is slower and when I asked it to do fairly complex tasks it would give a "network" error which 3.5 did not do. I also can't see an improvement in the quality and efficiency of code produced by 4 over 3.5 and it seems a little worse in some cases.