On the issues of bezel management, and side screen distortion: I think a lot of it is going to come down to the game developers implementation.
iRacing.com is a fairly serious racing sim with a whole lot of members using 3 screens via TH2go, and to a smaller extent soft_th. Because of this...
Great review Kyle. I just thought I'd point out that when three screen setups are more mainstream, the software developers will likely fix some of the issues you mentioned.
I am a race sim guy. iRacing is my flavor of choice.
Many iRacing users have three screens via TH2go, myself...