How sturdy is the glass trackpad on the MBPr late 2013?

I have a late 2013 MBPr 2.6/8/256 13"

It's really nice, and I especially love hooking it up to my 21.5" Dell external display and using it as my "iMac"

Anyway, the other day I dropped my iPhone 6 plus on the trackpad. It made huge thump and sounded pretty bad.

I don't see any damage, no cracks, looks pretty good.

I'm hope the integrity of the glass trackpad is still in place.

Any ideas on how much of a beating it can handle?

Thanks