I just used to run my old running shoes through the erg until they were totally dead.
The problem I have is I eat the heals out inside the shoe, probably because my heels are constantly raising out of the shoe on every stroke. Possibly would be better with some wedges in there as well, perhaps another 10mm might do it.
Switched to some elastic slip on type of sports shoes and leave the shoes on the rower, just slip in and out each row.
General discussion on Training. How to get better on your erg, how to use your erg to get better at another sport, or anything else about improving your abilities.