The only thing that catch my eye is the weird font text on the "REPLAY MODE - Watching <user> playing <artist> - <song> [<difficulty>]" and the OSR information at the top of result screen. I guess it's because the game can't find the required font.
The video has good quality (though not as good as what I uploaded myself, but I can't blame you if this is intended to allow other users to upload their OSR as well). Timing-wise, I find it acceptable without any noticeable de-sync. Upload speed is blazingly fast! :O I would love to see online scoreboard though, if only it's possible to see without logging in...
Overall, it's still satisfying nevertheless.
If you want me to "break" the server, I probably would go on uploading a lengthy Marathon map OSR, but I'm just afraid I would get banned from using the service for that.
@Elysion: Your video is set to Private.