ARENA TOUR 2002 isn't bad. I really liked the "I am..." performance and of course "ASFXX". She was dressed in asian style clothes on those two performances. What's great about ARENA TOUR 2002 is that a lot of the songs are not the original version. You get a different version of "ASFXX", "NEVER EVER", "M", "Dearest" (those two last are performed in acoustic). Also, there are 3 backstage clips of Ayu which are really funny and cute to watch.
COUNTDOWN LIVE 2004~2005 is not worth buying in my opinion. It was really just simple show. Nothing special. COUNTDOWNs tend to be less entertaining.
I liked ARENA TOUR 2002, but I think STADIUM TOUR 2002, DOME TOUR 2001 and A MUSEUM are better. Her CONCERT TOUR 2001 Part A & B are even better too in my opinion.