I was asking my self the same question..
Until last week at least.
Until I got Valkyrie P L OMG that game is sooooooo good.
I have about 16 hours into it, and Love it, My PSP is finally paying off..
Then we have CPS1 and Neo Support for the1.5 and the value just went off.
Now we add Tekken and the Value just went up once more..
Let's look at the future now....Metal Slug collection with MS6 included
so if you ask me if it's worth it, I say Hell yeah..
I love mine and I haven't put it down since last week, VPL makes owning the system worth it.
Now if we can only get this games in here it would be perfect
Castlevania
Resident Evil
Silent Hill (coming soon)
Grand Turismo
and I can go on and on...
Now a Mint 1.5 Complete Value Pack US for $180 I think it's worth it
http://www.neo-geo.com/forums/showthread.php?t=148788
well if you take the $35 for the 1gb Duo and $10 for shipping
But don't take my word for it, try it for your self, I'm sure you'll be more than pleased.