I've had loads of deliveries to Amazon lockers and it work's really well. Only issues to date have been:
- One order that ended up in someone else's locker and nothing in mine.
- Some items that are definitely small enough yet cannot be delivered to a locker. This is either due to vastly oversized Amazon boxes and/or presumably incorrect measurements in the Amazon system for the item itself (the latter often seems to apply to 'fulfilled by Amazon' third party products)