I just saw Concert Tour 2000 part 2 and find it awesome!!
of course things were much simpler, but many costume changes and lots of interesting intro and background videos (and i think the clowns were first introduced here?). If I were watching in 2001, i would have been totally blown away with the advancement in concept and technology.
I feel the same way watching DT2001, AT2005 and AT2010. However I'm missing that blown away vibe from the recent concerts (of course all of Ayu's concerts are amazing). But hearing from the reviews of CDL14 got me excited and hopefully AT2014 we'll see a breakthrough concept