Augustine Classic trebles are by far my favorite treble strings. I have never had a problem with intonation, and the tone, sustain, and vibrato is great. I find them to be very sweet sounding with just the right amount of brightness. I tried the Imperial trebles, but found them to be a bit pingy/metallic sounding. They are also stiffer in feel.

I have tried the Red (medium tension) and Blue (high tension) bass strings and thought both were warm and mellow sounding. They did not have the punch that I was looking for. Also, the string noise on the Blue set was the most I have experienced. I have moved on to other bass sets.

Hope this helps.