@ayang90, I don't understand why listening at 97 or 98 vs. 100 would produce better results since at 100 max output voltage is attained, but trust your ears. Have you tried using the balanced outputs from the MA3i directly into your Bryston amp?
@curiousjim the MSRP shown in the review is USD. It's a U.S. publication. Regarding why no I2s, Meitner states that based on its specifications, I2s "is meant to be an internal connection format for serial communication between system or modules, not meant to be an external format. Hence we don’t use it as an external interface [because] it would introduce more noise and jitter." So, they view it's benefit differently from those mfrs. who implement it.
As far as hearing a MA3i in person before buying it, that's always the best thing to do. But, it should be in your system. Perhaps you might be able to find a dealer that can offer a home audition. Good luck.