Yeah, EC and Seattle are great quality, as well as Copenhagen. The best recorded performances are Bristol and Glasgow. Copenhagen is the overall best bootleg, because it's got a good performance and great quality, as long as you have the right version. ;)
Earls Court's performance is definitely lacking at times. Don't listen to anyone when they say EC is one of Queen's greatest performances. People tend to confuse quality and performance quite a lot these days. :) http://www.geocities.com/qzboots
Have a look at my choices of the top Queen performances, and you might be surprised by many of them!
"The more generous you are with your music, the more it comes back to you." -- Dan Lampinskihttp://www.queenlive.ca