I have the MicroClock. Been using it/listening for a little while now and I say it works/sound good! Pretty simple looking tho' which Matt plainly says on the website. Haven't compared it to any of the " Hi-end" clocks ( Big ben, Antelope, etc.), but I definately hear a difference with what I 'm currently using. I'm using a PreSonus LT which was modded by Black Lion. ( the only one Matt has done!..thumbsup) and HD24-XR. As I said before, after syncing these up with the MicroClock, it was sorta like when you use a sequencer and use the quantize fuction. ( lightly)..

... Everything tightens up sound wise. ( tighter bottom end, cleaner hi's) Especially audible on playback ( even on previous recorded tracks ). I guess the clock helps the DA converters also! The converters on the XR as most people knows, sound pretty good stock. But the MicroClock makes them sound better ( IMHO). As I stated, I've never used the BigBen/Antelope, etc., so I don't know how the MicroClock compare to them. But as far as the clock on the XR and PreSonus, it's definately a step up from them! As always...YMMV......