I had a horrible time on 2x7970's on my eyefinity setup, but I had them on a 5970 before that and it was OK although it lacked the performance to really do it in many games. The triple monitor setup actually become awesome once I got the 2x 680's, surround was quite clearly better than eyefinity in setup/Windows and general use and it handled none surround games more easily without so much messing with settings. It still wasn't fast enough to really use it a lot but it was fine in the games it worked in. What happened was I noticed a lot of games were not supporting it, the list of new games coming out where I could use it had dropped dramatically last year and so I started to look for an alternative which is how I ended up on 3D vision/144hz. Having tried 144hz and immediately known that was my way to go when gsync arrived I knew I had to have the ROG swift and I am not disappointed. I understand why you are waiting, based on the way AMD has treated me and other customers it astounds me people still buy and keep their cards, the lies the deceit and their lack of standing by their products or even taking account of bugs and fixing them. AMD still has a white snow bug in Arma 2 that has been there since release, its a bum deal.
So your sticking with your current hardware and you like ultra wide I would say stick to what you have, we are meant to learn about Freesync next month anyway and supposedly its releasing in January so its not a long wait to see if its everything gsync is but for AMD. My reasons for switching was that I just didn't use the surround mode enough to warrant it, that was mainly due to the game support and sometimes performance.