I have a Minecraft server running on an Amazon EC2 instance, and the instance is bogged down regularly by the server's high requirements. I recently came across a page listing alternative Minecraft servers, many of them touting the reduced overhead of their server versus the Mojang server.
However, I can't help but think one is not simply a drop-in replacement of the other. Though servers like Lightstone seem to be pretty thorough, are they in fact lacking, or is it worth making the switch?