Well, it's early days, but we can say that it's like being given a microscope that magnifies everything in the cup, good and bad.  So, while that makes it the best thing we've purchased, it also gives us a lot of work to do in taking our roasts up to the next level.  If you are running all arabica roasts (as we generally are) you need to cram in the maximum coffee mass that you can, hard against the shower screen, and adjust the grind to get the extraction time where it needs to be.