No, it's a great question. All my previous experience with compressors were without a blend and the only usable effect I could get was the exaggerated poppy attack effect from maximizing the ratio/attack. Something I wouldn't use all the time. More subtle settings effected my attack dynamics and treble content in a way I didn't find pleasing. I just recently got an SP compressor and the clean blend allowed me to leave my attack alone while blending in the sustain of the effect as the original signal fades out. Clean sounding sustain is allowing me to play some long ringing phrases without the dirty gain I might have needed to play those notes. On some songs, this is indispensable. Blend has completely changed how I use and think about compression.