On the topic of reclocking...
Coming from the pro audio world, most gear that uses S/PDIF, ADAT, TDIF, AES, etc etc all has a non-disable-able reclocking feature. Hell, a lot of companies advertise their PLLs! Beyond that, generally the advice generally speaking is that unless you're connecting multiple AD/DA devices together, the built-in clock is almost always better than even the expensive ones, because the amount of jitter introduced is generally worse performance.
The first time we saw separate master clocks appear as "this will make your gear sound better" was right around the release of the Digidesign 192 for Pro Tools HD. Because of its shockingly bad internal clock design (extremely high jitter due to a weird implementation of freewheel for the audio-for-video post guys), using an external clock like an Apogee Big Ben actually made clearly audible improvements (even blinded). Of course, once Avid/Digidesign got their act together with the HD I/O, it was too late - people were spending pots of money on clocks that made no difference.