F-Throw to F-Throw is an official chaingrab on a wall. Or Wall Lock, or Throw Lock, or whatever it's being called these days. It gets Boozer from 0% to about 50%, and you can usually follow it up with an UpB or an Uair. On Jigglypuff, it's next to useless. Like... RIGHT next to useless. Half a pixel away from useless. If it were any closer to useless, they'd be legally married in 42 states.
Everywhere else, everyone can DI -> Spotdodge, Roll, Jab, etc. out, including at 0%. *
That being said, it's still fairly useful, since everyone falls for it a few times since nobody knows a **** thing about Falcon anyway.
*Tested on Bowser, DK, King Dedede, Snake, MK, Captain Falcon, and Lucario. Further testing is encouraged.