It's just about impossible to find fault with this collection of Supertramp's best known tracks, either on a value or completeist basis, and it is certainly a better package than earlier attempts at a "Best of..."
The label "soft-rock" has been slapped on them largely as a result of the tendancy of their later albums to be made up of three or four minute US radio-friendly pop/rock material. Fans of the band at their peak, creatively and melodically, will say that the three albums "Crime of the Century / Crisis What Crisis / Even In The Quietest Moments", from which most of CD1 is made up, were definitely not soft rock (they will, in fact, probably argue that you should leave this release alone and buy the three individual CDs, and turn the volume up loud when you play them).
Rick Davies supervised the compilation and all the tracks have been digitally remastered. Comparing them with the vinyl originals does reveal a slight loss of edge and clarity but most people won't notice. Overall it's an excellent review of one of Britain's (yes, they were British) best rock bands of the late 1970s.