I continue to marvel how great the J2 sounds. Jazz, Metal, Classical, even electronic music (maybe not as snappy for electronic...but close enough). I was playing 24/96 of Led Zeppelin 1 and was really cranking the amp (89 on BHK volume meter), this thing is so distortion free it is scary. Plus, I had more room to go if needed. Right now, outside a dedicated streamer (vs computer) and more room treatments, I do not have the urge to do any upgrades. Certainly that will change eventually, I really feel I got everything system wise dialed in perfectly.