I've bought a fair bit of gear from DWI over the years and never once had any problems. I think 6 business days is the longest I ever had to wait for my order to be in my hands.
I can also recommend D-D-P (
https://www.d-d-photographics.com.au/) which are Australian based grey importers. Very fast delivery and good service. Also no risk of customs duties either, the order/delivery price is ALL you pay (if they have to import the item, they will pay any duties).