I haven't used a compressor live. I'm compressed in the PA but I don't use one on my board which has my tuner, JDI and Rolls IEM amp. I tried an MXR M87 for a couple days at home. I set it to be very subtle. Just even things out a bit. I noticed that it did help with my Low B string, but I didn't notice it as much on higher strings. As I switched it on and off I found that while it sounded good with it on, I was able to control my attack a bit on the B string and achieve almost the same sound with it off. So, my dilemma is this. Am I just being lazy by using a compressor and not having to "think" so hard when I'm playing? I have since added a 6 string to my stable and find that it is a bit of a challenge to keep things even on that big neck. Any thoughts?