Thanks Ted. Yeah, a major seventh chord is pretty subtle...and even moreso depending where the root note is. A simple A maj7 (002120) because of it's voicing is quite distinctive. Likewise a Cmaj7 (332000) but the voicings for a lower position G maj.7, are quite different and simply won't sound the same.
'Cause I play solo so often I try to get the fullest chord possible at all times, and there are certain keys that just have what you're lookin' for, and others that don't. If you're working with a bass player (who knows what they're doin') it's a whole different pallette.