The ever kind Voltron has lent me his FET-A for a few days. The dimensions come close to the Duet, which may make a very convenient transportable combo. And possibly superior price-performance (for phone use) to various one-box solutions (Benchmark, Grace, Lavry), while admittedly losing a lot of functionality. It seems fewer use one-box setups than once did, however some over in the HF HD800 thread (well, last I checked) still seem to be aiming for one.
Anyway, will see over next few days on the SQ and synergy fronts.