UK Reship is excellent, US not so much.
Many say this service is a scam but it isn't. I haven't had them charge me any fees that were not already plain and clear in the pricing plan you choose. The only thing you don't know is what the shipping cost will end up being until it is time to ship. Keep in mind, at least shipping from the UK, the Royal Mail option seems to be only available for small items (like a single pair of shoes). It disappears if you ship larger items and all you are left with are UPS, DHL and PostNL with UPS being really the only viable option. I've mainly dealt with the UK Reship warehouse and the team is very efficient there. Packages delivered and requests made there are often processed in under an hour. The US Reship warehouse however is a different story, they are very slow. Not sure if they have way more volume but I've seen up to 3 days for a delivered package to finally be processed. Mobile app isn't the greatest either so I prefer using the webpage but overall, other than what I wrote above, I've had zero issues with the service.