Think of it as Robotron: 2084 played on a sphere with continuous waves of random enemies and difficulty that ramps steeply the longer you survive. The AI is completely ruthless, and willing to drop roughly eleventy billion rocks and lightning fast enemies on you at one time if that's what it takes to kill you. Oh, you will die cheap, humiliating deaths but the game is just fair enough to leave you thinking it's your own fault for dying.
Which is to say, I love it.
I thought SSHD was pretty much distilled arcade action, but I was wrong. This is better -- a lot better. I'm not sure I'll ever play the other modes ever again, much as I can't play Twisted Metal 2 ever again without homing napalm.
If you own a PS3 and love fast arcade action games in the vein of Robotron, you owe it to yourself to buy Super Stardust HD. Buy it with the Solo Pack upgrade and get one of the very best experiences the PS3 has to offer.
Great recommendation -- we really needed a modern take on Mattel's ASTROSMASH for the Intellivision.
It's also cool that one can still play this moldy old game for free. Start with www.intellivisionlives.com or just run the game in your browser at http://games.vh1.com/online.php?gid=33