Multi-player game servers?

Hello everyone,

We are a small development team considering creating an online Flash AS3 multi-player game… which we’d eventually like to deploy as a Facebook app.

The game would be like a simple one-on-one hockey-type game, where players attempt to get a puck into a goal. So there would only be two players in a ‘world’ at a time, but we would need real-time connection speeds to sync positions and states.

I’m wondering if anyone has any experience with existing game servers out there like DarkStar, Union, Hemlock, or SmartFoxServer to do a similar game- the key is the real-time “action game” speeds for us, and whether that is workable. Any pros/cons, considerations of cost, etc. would be helpful. And to throw another factor in to the equation the game would likely be rendering 3D papervision scenes on the client side.

Thanks for any help or advice!

-rich