NGPC jap/us different versions?

Hello,
I decided to buy a NGPC and I got some offers but I don't which one to buy.
One is japanese crystal-clear and the second version. The other is the us version.
The seller of the fist one says that the second version of NGPC is more handy and has a better sound. Is this right?

And I found another topic here in the forum where is written that you get problems with a jap Version when you put in an US game (it will turn in japanese) ?! I didn't understand everything. Does it depends on the game or is that with all. If it depends? Which games are this.
And what's with PAL Games?
Hope you can help me,
Alex.

The second version (JPN revision) is 25% smaller and has a louder speaker (supposedly).

As for the second part, as the screen is self contained there's no PAL or NTSC compatability issues. In the mean time, SOME carts let you select the language in the pocket menu. And all carts from any reigon are compatable with a unit from any reigon.

It's true, my crystal neo pocket is far louder than the normal one. also i find it comfier and the batteries seem to last longer. i say go for the crystal. theres no region lock on neo pocketgames so imports are no problem, oh and welcome to the site

Thank you for the informations and the welcome.
I will buy the Chrystal.
Now I have to go to bed. Here we have 03:38 a.m. and I get only 2 hours sleep <img src="confused.gif" border="0">