i have a JVC camera and have always used Sony tapes. i wonder if switching to Panasonic would be OK, or should I stick with Sony now that I've begun with Sony? then again, I've never had any problems with Sony tapes, so I guess if it's not broke, don't fix it? also I'm wondering if anyone has any experience with those higher levels of Panasonic tapes (the PQ and AMQ grades)? there's a pretty big price difference but is there any noticeable quality difference?