Had a couple SM VGCs fail today when making a MO run. Hit 3 different locations, the first was a complete bust (pretty sure the CSR was not entering the $500 debit properly on her end so the transaction kept failing) and the third one she had to split it in 2 as the first 2 cards went through fine, but something was going on with her terminal for the third and it wasn't going through. When I looked at the receipt for that one, it showed the attempts to bill the remaining $1k to the cards. But she did run another transaction for the 2nd MO and it ended fine.
In two of the three cases, I had to show debits with my name.

I have 6 different "real" debit cards, so once they saw those, there was no problem with the transaction when I went with the gebits instead.