I let my premium membership expire, so the analysis feature available to non-members is not as useful. For example your overall best moves percentage is not available, nor is it available for the piece move evaluations.
Also, I believe the game move analysis doesn't go very deep, so the analysis of some moves will vary when checking with an external source that run deeper.
However, for my purposes, it's good enough.
Now you can analyse your games as you finish playing them. This is an excellent feature and saves the trouble of using a separate analysis application. I was using Lucas Chess to analyze my games but the chess.com feature runs faster and is more convenient to use. So three cheers for the chess.com team that came up with this idea.