Having just upgraded from a Pass INT-150 integrated to Pass separates (xp-10 and x250.5) I can say that there was an improvement. While the INT-150 is a very fine integrated there is a noticeable improvement with the pass separates. I notice an improvement in separation, transparency and detail. The real allure for me was the additional flexibility. I can mix swap out different amp & pre's into my system and have greater customization over my sound. None of this to say that you couldn't thoroughly enjoy one of the many fine integrated's on the market today. Variety is the spice of life these days, there is something for everyone, just depends on what you're after.
