A month ago I was in need of some parts for my 87 300SDL. I placed an order with AutohausAZ on a Friday, got the parts quickly. Last week I shipped the used parts that needed to be returned (core charge). I just now received an email saying that the proper credit had been issued for the core charge. I'm impressed that the vendor notified me instead of having to wait till the CC statement comes in.
Anyhow, two thumbs up.