The teeth feel much catchier after filing them with a triangular jeweler's saw (left half is done), but it still takes a minute of rocking the but back and forth to get through 3/4" plywood.
You can fix the warping, or close-enough to "fixed", if you're poor or cheap or just obsessed with wringing the value from each purchase ( hi ).
Luckilly, the line between "fixable" and "holy shit, this things wobbling so much its going to grab, walk its way off the board, and cut into my leg" is readilly apparent, to anyone who has any business using such tools.