I hate the fact that their stuff goes OOP. I know that it's unaviodable, but it still pisses me off. I saw the 400 blows for the first time a few months ago, and I liked it a lot. I missed the Criterion boat on that one by a long shot, and now it's like $250. I know that the movie can be had for much cheaper, but I really like Criterion's style of historian commentaries... And I just like Criterion. Their menus, their boxes, their design - all top notch.
If you want a great version of the 400 Blows forget about Criterion. Use the $250 to buy a Malata or other first rate region free PAL/NTSC converting DVD player and get the MK2 (Region 2, France) $20 DVD of the 400 Blows which is vastly superior to the Criterion.
It has a great anamorphic transfer (Criterion did not), and all kinds of extras ranging from remarkable actor audition films (you quickly see how much of the protagonist came from the actor himself) to documentaries, commentary and Truffaut's excellent short film Les Mistons (The Mischief Makers).
Unless you view OOP Criterions as a money making proposition, sooner or later something better will come out.
Ted