Cant say it's something I had to get used to either. It's been pure awesomeness since day one!
But if it's not set up correctly, you might miss the whole point with it. Especially when it comes to gaming with eyefinity, you want to have the screens in a comfortable position with a good angle, all depending on where and how you sit in your chair. In order to really appreciate and feel the wide deep perspective, I strongly recommend you to also sit in a very dark room. You dont want anything in your surrounding to ruin the view of your screens. And as mentioned, you only look directly at the middle-screen, while the side-screens are simply there to "widen" your perspective ;) Point is, what you experienced in the store is most probably nothing compared to how it will be when set up at your own desk.
There arent many real advantages with it in gaming (Except possibly for some simulators), but it adds a lot more immersion.
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