I have extensively demoed (or owned, in bold) the following headphones: AKG K812, K712, K702, K701, Q701, K550, K271, K240 Studio, K77; Audio Technica ATH-M50X, ATH-M50, ATH-M40X, ATH-M40fs; Beats by Dr. Dre Executive, Pro, Solo HD, Studio; Beyerdynamic T5 P, DT 990 Premium 600 ohm, DT 990 Pro, DT 880 Premium 250 ohm, DT 880 Pro, DT 860, DT 770 Pro-80; Bose Quietcomfort 15, Quietcomfort 3, Quietcomfort 2, AE2; Creative EPH-630; Denon AH-D7100, AH-D600, AH-D340; Etymotic ER-6; Grado PS500, Grado GS1000, RS1i, RS 1, RS 2i, RS 2, SR325is, SR325i, SR225i, SR225, SR125i, SR125, SR80i, SR80, SR60i, SR60, iGrado; Koss Porta Pro, KSC75, The Plug, UR10; The House of Marley Redemption Song; Sennheiser HD 800, HD 650, HD 600, HD 598, HD 595, HD 558, HD 555 (also modified to HD595), HD 380, HD 280, HD202, HD201, PX 100, Momentum On-Ear, Momentum Over-the-Ear; Shure SRH1540, SRH940, SRH840, SRH440, SE835, SE535; Skullcandy Aviators, Crusher, Hesh; Sony MDR-X05, MDR-XB500, MDR-7506, MDR-V6, MDR-55, MDR-CD30 (I almost forgot about these; purchased at a garage sale about 10 years ago); Superlux HD681, HD688B; Ultimate Ears TripleFi 10 (family member owns them); Ultrasone HFI-780; Westone UM Pro 30, UM Pro 20, UM Pro 10.