Luckily I've only ever had one package never arrive in my life and it was from BBTS 3 years ago, but they fully refunded the purchase.Honestly, it's not so much the wait as me not trusting the local services. When you have a package stuck in customs for a month, you get anxious. I've had tons of packages from BookDepository never show up. Thankfully they have a great refund policy. But still. It's why I always go for the mid shipping option, there's no point in paying for the "fast" one.
Around these parts, there's no logic, only "comfiness". It's the summer, so they "take it easy".
This package apparently landed in the UK last Thursday, haven't heard a peep from the tracking since.