I saw "Comin' At Ya!" when it was released in 1981. Remembering that it was highly entertaining, if cheesy, I happily threw down my 14 bucks for the DVD re-release. If you're thinking about buying it, three words: Don't do it.
Rhino has converted the film to the red/blue 3D process (as opposed to the polarization process--if you've seen the 3D movies at Disneyland or Universal Studios, you know what I mean), and the results are horrible. Not only does the 3D not work, the red and blue lenses ruin the color (red/blue 3D is better suited to black and white movies or monochromatic comic books). I gave up the glasses after ten minutes, muted the colors on my TV, and fast-forwarded to the fight scenes. It wasn't even worth the 14 dollars I paid for the DVD, and I'm taking it back.
I'm very disappointed with Rhino for even releasing the DVD with the shoddy 3D. It's as if someone said, "Yeah, the 3D doesn't work, but who cares? They'll buy it for the gimmick." If you absolutely must see it again, rent it or con a friend into buying it. Because it is absolutely not worth the money.
As for the movie itself--c'mon, rubber bats on wires; flaming arrows; spears bouncing along on half-taut wires as they come "right at you"? That's what 3D was made for. The director uses every excuse to throw things at the camera, and then some. Most of them defy logic. But it might make a good party game to predict what object on screen is going to come at you next.
"Comin' At Ya!" is pure 3D cheese, and I loved it. Just don't expect good 3D.