Unfortunately, the situations is not so good in crossfire: Tearing is back.
So crossfire + eyefinity is improved but still not what we expect.
Still the same as years ago. It's a bit sad. Nvidia's new models are a bit more suitable for beginning triple screeners at the moment I believe. Their models have many DVI and a HDMI port, so you can always hook up three reasonably priced monitors without worrying about tearing what so ever. The prices are also going down compared to previous years. SLI still has its problems though, same as Crossfire. But for people who are new to the scene I would really recommend one of Nvidia's new cards.