I introduced my Sony PSTwo to my friend BBQ this weekend. He thought it was slick and his old modded PS2 seamed mammoth and girthy but it is not about the size of a boys Playstation but how ones uses it.
We tried to get imported Japanese games to boot up via his boot disk but it did not work. If you are looking to play imported Japanese games on a US PS2 than you better stick with they first design until the united hacker underground figures out a way to get them to work on the new smaller quiet PSTwo.
as I mentioned already in another post: bootdiscs and modchips and stuff will need a little more time to work whit the smaller PS2.
I've already seen offers for Matrix chips...