While it's great that Apogee have put a 4pin XLR on the Ensemble, apart from their excellent converters, there's not much else to make the box superior to anything else on the market. Apogee claim that the Ensemble is "the first all digitally controlled, professional audio interface, designed specifically for the Macintosh". I have a pair of Metric Halo 2882's and they are definitely Mac only and have been around for over 5 years. Also the MOTU Traveler has simultaneous AES and SPDIF in and out giving it 4 channels of digital I/O whereas most of the other interfaces are AES or SPDIF, or in the case of the Apogee, SPDIF only.
The interface that I'm considering for next year is the Sonic Studio 304, which is effectively a Metric Halo 2882 but is line level only and has 8 channels of AES I/O in place of the ADAT I/O. I want the the 8 channels of AES to connect to a second recorder.
On the subject of 48.048, I use a recorder - currently a 744T or an Ambient Lockit to guarantee a highly accurate time-base to clock my interfaces. While it's quite possible that say the Rosetta 800 has an accurate clock by film and broadcast standards, most products aimed primarily at the music market will claim a stable clock in terms of low jitter and digital purity, rather than an accurate low drift time-base.
David Madigan