Well I actually don't see any reason for you to keep the TH2Go. Unless you're trying to save your ports for more monitors.
I went straight eyefinity right after release because I had 1080p monitors at the time and I couldn't get that with the TH2go (at the time).
You also get the ability to change individual monitor settings (i think). It maybe better, because some game auto sense that you're using surround whereas they wouldn't have a clue using TH2Go (or eyefinity for that matter).
EDIT: Also, you shouldn't see a degradation performance as both options SHOULD be hardware based, though surround used to require SLI. So IDK.
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