NowJS, SocketIO and Pusher.com

What are pros and cons for NowJS, SocketIO and PusherApp ?

Favorite Client Language: JS

Favorite Server Language: NodeJS

Socket.io

Pro:

  • Uses your favorite languages.
  • Do it yourself solution. Could also be con.

Cons:

  • Scaling could be problem. For example users have memory leaks when using websockets. Also does not have proper support(yet) if you want to scale to multiple CPU's/boxes.

nowjs

nowJS uses socket.io to provide RPC-library.

Pro:

  • Simpler to use sometimes I guess.
  • Uses your favorite languages.

Cons:

  • Some scaling problem as socket.io

Pusher

Pro:

  • Scaling easier.

Cons:

  • Costs money when you get big. Maybe to much?