Just got one today and am really impressed! I've used the Diamond for a long time and decided it was time to explore a bit, just to see what is out there. The Empress is killer...fine tune both the attack and release, 3 compression ratios to choose from which is nice if going from single coil to humbucker, a blend control like the Tone Press, and input & output control which lets you further dial in exactly what you want. There is abundant squish on tap if needed, something I've kind of missed from time to time on the Diamond. On top of all that it just plain sounds great. So far I've only tried it with the Ecstasy and it clearly works very well with this particular OD. The only negative I can find is you need to memorize what the knobs do because in moderate light you'll never be able to read the small print. Maybe Empress will pick up on that and make adjustments, as I've read others complain about this too.