The "US" servers are actually in Canada. I use them and the performance for streaming is slightly better. Although I wouldn't really be worried either way as I don't use public torrent sites.
Thanks for posting about this. I hear about seed boxes, but never thought it was affordable to rent one. One question: after downloading the files, how easy is it to get them back on a home computer?
1) Open Whatbox from Chrome, or any other browser on your home PC/Phone/Tablet. Its all HTTPS, your ISP can't know what you're doing. It is just like any regular website, not an "app" or anything at all special about it.
2) Find the torrent in the list of files.
3) Right-click on the file you like (e.g. the big .mp4 file) -> Download. Chrome will download it like any other file and save it anywhere you like.
4) Profit!
If there is a large number of files (e.g. full TV season), use an FTP client. Instead of right click -> Download on a file, do right click -> Download on the entire folder, or drag drop to where you like it on your PC. Can also work just as fine on any FTP client for Android/iPhone.