Site official: https://www.chess.com/ 

 Diamond membership= 99$;  Platinum= 49$; Gold = 29$ (all about: HERE)

can play for free, with the limitations of the various functions and options.

  YES

 YES (only)

Utilities offer: PLAY; WATCH; USERNAME; CHAT; SAVE GAMES; STORED RATING; LIVE BROADCASTS; TOURNAMENTS (organized by the administrators or members of club/Diamond, Platinum or Gold); LIVE COMMENTARY; SIMULTANEOUS EXHIBITIONS; INTERNET CHESS TV; OTHER VARIANTS OF CHESS GAMES; VIDEO; MY GAMES ENGINE ANALYZE; TRAINING; NEWS.

Tournaments with big prizes for titled players. USCF rated games/tournaments. One of the best app for mobile devices.

What can improve: New methods to detect cheating in real time; More effective penalty for laggers. Reducing prices and only two categories. PRIZE TOURNAMENTS FOR AMATEURS.

Conclusion: the best server for top players (big prizes) and a very big variety of stuff for chess.

 Shopping store: http://www.wholesalechess.com/?utm_source=Chess.com&utm_medium=affiliate&utm_campaign=Chess.com