I was worried about this when I turned it on myself, but under the usage panel it shows that it limited my spending to just the $50 and that auto-reload is off, so it doesn't seem this would be the case.
I turned on this overspend and limited the spending to $20. A day later I checked my spending, I had used "295%" of my limit. Almost $60. No idea why it didn't respect my setting.
brulard|25 days ago
nezhar|25 days ago
dude250711|25 days ago