WebSockets are super easy to use (we still love it offer support for it), but if your users are on older devices or browsers you're going to run into problems.

WebSockets are super easy to use (we still love it offer support for it), but if your users are on older devices or browsers you're going to run into problems. You also have to take into consideration different network issues, for instance last year Verizon 3G blocked WebSockets without any documentation. Or fragile wireless networks where the socket will break.