We've been using WAL-E for years and this looks like a big improvement. The steady, high throughput is a big deal – our prod base backups take 36 hours to restore, so if the recovery speed improvements are as advertised, that's a big win. In the kind of situation in which we'd be using these, the difference between 9 hours and 36 hours is major.
Also, the quality of life improvements are great. Despite deploying WAL-E for years, we _still_ have problems with python, pip, dependencies, etc, so the switch to go is a welcome one. The backup_label issue has bitten us a half dozen times, and every time it's very scary for whoever is on-call. (The right thing to do is to rm a file in the database's main folder, so it's appropriately terrifying.) So switching to the new non-exclusive backups will also be great.
We're on 9.5 at the moment but will be upgrading to 10 after it comes out. Looking forward to testing this out. Awesome work!