I have mixed feelings with ultraseedbox too...
I first got a M-WIND plan and everything was TOP but, I ran out of data after 2 days :/
I got access immediately
Speed was consistently TOP no dropouts!

Then I decided to get a JAGUAR plan.
It says you get access immediately, but it took hours before I got it.
Everything was fine the first 2 days and I got some AMAZING speeds:
http://s28.postimg.org/fd5h4558b/screenshot_155.png
Then after a few days the upload would sometimes go down to max ½MB/s for sometimes 1 hour and just be really inconsistent.
Also after a few days my seedbox would be totally unreachable, meanwhile my other M-WIND plan was totally reachable.
I couldn't do anything. After a few days I got access to it again and all the torrent.files was apparently gone...
I think the inconsistent speed is because of the shared disks, and if a user "checks" a torrent it uses all resources on the disk, so your client can't read anything eg no upload

I also have the same experience with support.