We've beenusing the D 500 right out of the carton for events.. multi day or week long conferences, etc, and also weddings. We are so pleased with the results we've not seen any need to open it up and play. We ALWAYS use frexhly roasted coffees (our own roasts, typically 2 to 4 days off roast), and the pre-programmed "bloom" cycle seems to do what needs to be done. I find, given the same lot and roast of coffee, that machine is a very near match to a well-handled French Press in cup quallity. I always enjoy drinking our own coffee when we do events, where I used to drag out my own Frogpot and antique Dutch box mill and brew on the sly so I and close friends have something decent.
It did take us a bit to dial in the brew.... first getting the grinc setting correct for flavour, then fiddling with dose to get strength right. I have found a few of our coffees need a grind setting one notch away on the gri