Four whole hours.... wow.
Been dealing with Adorama as preferred vendor #2 since the mid 1990's. Used to be Calumet #1, then B&H #2. B&H moved up to #1, Calumet got dropped (too many mistakes... sending wrong items, short dated film, etc). Adorama took the #2 spot.
Never had an issue. I think I've only had two returns on items - nothing wrong, just the item wasn't as I thought it would be. One was an EF lens, I can't remember which. OTOH, I'm very careful about preserving packaging when opening a shipped in item. I know I might want to send it back - rare but it happens, and having worked photo retail for a decade, I can appreciate doing the return guys a favor, and avoiding hassles for myself in the process.
B&H also got a lens back once, and I can't remember anything else from them.
Mistakes happen - when they happen with regularity - such as Calumet sending VPL instead of VPS (we're talking 5 bricks of pro-packs at a whack... wrong stuff... and more than once! And thats just an example...), then you switch vendors.
If you treat your (quality) vendor with respect, you'll receive it back from them. I avoid schlock-houses at all cost, no matter the deal or promise.