See Stereophile article that compared the Fifteen to Levinson and Krell. Original owners have lifetime warranty. Note parts quality and burn in and match before build. One of 2 used as monoblocks. I decide to keep one. Please note scrapes on left handle. Classe mentioned to me that they did special orders on this amp, seems like some wanted 2. I've A/B with best Pass and it's a toss up. Soundstage is to kill for, wide and deep. I sent my Classe box to California to get this one. Both sourced from Bay Area Audio back in mid 90's. No repairs needed or mods. Second owner.