The D'Agostino is really the ideal integrated if you want the best of both worlds tube and solid state sound in one single package.The sound is extremely engaging, organic, smooth, fast, detailed and very solid bass, it's never analitycal.The Vitus is pretty close but not as warm sounding.It is very transparent, fast, big slam and liquid sounding like CH Precision.The CH doesn't have the slam of the Vitus.I also know the Diablo 300 quite well and IMO the Vitus is in another league.