Yeah, saw it last night, was pretty awesome. The plot twist was fantastic as well, hope no one spoils it around here, it's just such a lovely moment in the theatre, everyone was literally laughing at the premiere.
As for the "stay after the credits", I wish you told that to the guy who was handling the projector. While about 25-30% of the theatre stayed seated after the credits, the guy at the projector apparently didn't get the memo, didn't watch/play a single Marvel movie so far, had no idea what he was playing, no eyes to see the amount of audience waiting and no respect for the movie to let the credits play through. So RIGHT BEFORE the ending scene... the moron cut the video. The sound was still there, so while we started to doubt a little if there would be a scene (the movie really feels like an Iron Man finish), we heard the sound playing the scene. Then, after the audience started shouting, the guy turned the video back on, then backed up... to the final scene before the credits. So after waiting some half hour, the ending scene received a really lukewarm reception, which, while it's not as awesome as the previous movies are, it doesn't quite deserve.