I was in line for brown belt when I moved and changed to a different USSD dojo. The sensei there never trained me in brown belt material. In class he'd take me away from my brown or green belt partner and send me down to work with the white belts. He'd never teach me brown belt material although he taught it to his pet students who were a couple ranks below me.
I was supposed to have a private lesson every week where I'd get specific, personal training for improving my skills and moving up in rank. The sensei would disappear after a couple minutes to either train other students or sit in his office and get on the computer or just yak with other people. He'd come out a minute before my lesson was up, which wasn't enough time to do anything with.
I was paying almost $200/month, yet I was treated with disrespect and made a laughing stock in the class. I was an older student, and obviously not a jock, but I took my martial arts training very seriously. I tried everything I could think of and gave the school every chance I could, but it became painfully obvious that the sensei saw me as a permanent white belt despite the color I was wearing around my waist. And I'm now too old and too disheartened to start over with another school and another style.
I honestly can't recommend USSD to anyone. I'm sure there are martial arts schools that treat their students with respect and give them their money's worth in training. USSD is not one of them.