well.. i like the dynacomp, its only got two knobs so it's ideal for a quick fix. and i chose the dynacomp over the supercomp because.. 'if its not broken, why add another knob?'
the comp smoothens out my playing i guess, a more even attack.. specially when you're doing a fast line or fill, evens out the peaks in your signal (for me at least). i also like it with slap, even though i don't slap much *clack*!!
so yeah, on the downside, at the higher sensitivities, it does tend to get a little noisy, but i don't use that much compression anyhow.. so i'm just happy with my current setting, first time playing with a compressor, i dunno if i'll ever need to get a multi-band comp. maybe when my ears are more tuned to nitpick that elusive bass tone -)