If you like the sound of the 1590, then i say dont send the mids. Ive sent tons of stuff over the years, and service much more of my own. Ive had every ADS, including the 2030 and biamped them and others with the c2000 and much more. Ive had, oh...5 pair of 910, 3 pair of 1590, 1290, 10 pair 810 much more 710, have bare drivers and more to show for years of ADS love. The mods for my 1590 i got back, i did not like. Over the years ive adopted policy to never send a driver out for a new VOICE COIL when its simply got dust on it. I sold my 1590 within the first week. I will continue to send drivers but NOT for dust, and NOT to have the coil replaced just because it needs fluid. The tweeter and woofer, all day long. My opinion based on my experience.