Like I told someone who received one for his birthday and was unsure whether or not to return it and get a 360, you're better off not (opening it) buying it, or else you will never put it down.
I've been playing it a lot recently and it really has this weird ps2, SNES vibe. It's quite possibly the best console I've ever owned next to SNES/dreamcast/ps2.
If you really want to feel like you've made the right decision, you can't go wrong either way. If you get one, you will love it. If you buy something else, never play with one. Ignorance is bliss.
Either way, you'll be happy......just don't ever play one if you don't get it. You'll be crushed that you didn't get it.