We've been buying from GC since the late 70's. All levels of transactions in multiple states: new, used, pawn, returns, layaway, online, -zero problems, zero bs.
Sam Ash otoh, seems to have a corporate system engineered for a circus of store-wide f-ery. Every transaction from an in-store pack of strings, a bag of picks, to a credit card purchase, to an online sale, seems to be a quagmire of lunacy and compound misunderstandings. Involving at the store level immense wait time and multiple manager level employee bail-out and troubleshooting sessions at the cash register.
I recall once buying a bag of picks taking nearly an hour of time. Online transactions seem to require multiple phone calls to chase down, verify, validate, and re-order nearly every purchase.
I've noticed over the years that their system seems poorly designed and overly complicated and isn't really understood by the floor level people and all seem to have multiple personal "work-arounds" to just get things done which seem to back fire regularly.
In the end we get what we want, but they sure make you work for it.