Let me offer two things about this.
I got one for my wife last January and she still LOVES it (and me). And I gotta say it's pretty awesome.
That said, don't buy this and expect to flash a ROM on it without a lot of heartache. I've successfully done dozens of Nooks, G Tablets and many phones, but the Galaxy Tab is no picnic. There truly is no stable or totally reliable mod for it right now, and therefore is very apt to brick.
Even if you do succeed, getting it back to stock is even harder. You'll find more tales of woe than success stories of reflashing to its original state at XDA-Developers' forums.
Do so at your own risk, but I wouldn't advise it. With the Galaxy Tab, it ain't broke so don't try to fix it. And with an OTA update to Gingerbread coming soon, let it age like a good wine.
JUST my two cents.