I've never had the need for strap locks, but I sure like to have them on, anyway. I have a couple of guitars that don't, and they make me paranoid.

I use Schaller, never tried the others. And immediately replace the supplied screws with a heavier and longer screw.

Sorry to hear about the drop to the marble (of all floors!). I can sense the rage in the post. I would have been livid for days. :p