I gave seedunlimited a try and I have not been disappointed. Granted, I have nothing to compare it to, but it is the single reason I have managed to upload 253 GB in 4 weeks. It could easily have been more, but I was not proactive enough. (Is ratio-seeking behavior frowned upon? 
). Back to the merits: The setup was prompt even though the website sets expectations low. I would call it a "reseed box" however, because I think uploading original stuff would be a substantial challenge. Perhaps my experience is unique, but ftp/sftp seemed unusually slow. Likewise, uploading or downloading from the file manager was strangely sluggish. I had no problem downloading over simple http via the "Downloads Folder" on the control panel. (As for WebDAV … I would rather write down the 0's and 1's as someone read them to me via telephone than give that protocol another chance.) With HTTP I max out around 6
None the less I am poking around for other options. How do you know you have found the best until you have tried them all? 