I'm the one above in PFM who went from the Mytek 192 to the Vega. In short, the Vega is a big jump up from even the Mytek. I too subscribed to the "DACs, when decently designed don't have much difference" so I home demo'd the Vega. Needless to say I didn't want to return it afterwards. I then plugged the Mytek back in after letting it warm up for over 24hrs, and played the same tracks. At that point there was certainly no going back, especially when playing PCM material. The Vega has a naturalness to its sound that just goes unmatched to anything I've heard previously from digital sources. Rich timbres, stunning dynamics, soundstaging that's so wide and solid that you'd not believe it. Worth a home demo!
Just bare in mind when you first get the unit to let it run in for 24hrs + before you try more aggressive clock settings. Exact mode doesn't make a huge difference overall, but I find its benefits come from music that has sheer complexity to it, to which switching to Exact mode brings out a solidarity I've not heard from digital before. Audio emotion were excellent as ever.