One thing I've been working on lately is a slow, controlled vibrato. Nothing can kill a solo, or even a general riff, more than obnoxious buzzing-insect vibrato. Thing is, sometimes you want to add a little bit to a note or two in a section of music that's a bunch of high-speed notes.
Since you don't really have "time" per se to get a few slower motions in, what do you guys prefer - skip the vibrato altogether, or try and stuff it in there without overdoing it?
It depends. Usually I'll skip it, but a quick microtonal up-down bend can be good coloration sometimes.