Reviewers seemed to think that all of the songs seemed "forced" for the venue, and that they lost the power of the studio versions when made acoustic live. I haven't heard it yet so I can't give my own opinion, but as a Band of Horses fan I hope it's as good as you say.
I got myself copies of mirage rock, cease to begin and infinite arms. I can see how they say the acoustic versions lost 'power' compared to the studio versions.
Acoustic at the Ryman is a very stripped back affair, but i still love it.
Have you had a chance to listen to it?