Philippe...this is exactly what I've heard, also. A friend who has one (and a CT-5) also thinks the amp is under-rated and a sleeper. They are more numerous on the used market...you almost never see Premier 350s for sale.
Love to actually hear an ET250S sometime.
conrad-johnson CT-5 and LP70S, Michell Gyro SE MkII, SME V, Koetsu Urushi Vermilion & Rega P5/Sumiko Pearwood Celebration II w/ EAR324P, Clearaudio Concept/Grado Sonata1 mono 2w/ EAR 834P, Oppo BD-83SE, Schiit Gungnir DAC, Schiit Loki DSD DAC, Mac Mini/Audirvana, Dynaudio Contour S3.4, REL R-305, DNM speaker cables, Audioquest Colombia, Soundsilver Sextet and Zu Mission IC's, Shunyata Zitron and Black Mamba CX power cords, Shunyata Triton