I used sync pro for years. Only when forced I'd use their mobile website, and I'd I used desktop I had res installed. I couldn't stand their interfaces.
I didn't even realize there was an ultra. Would sign up with ultra here. I used sync pro for years and although I haven't Uninstalled it yet, I've removed it from my home screen, effectively removing it from my daily usage. Jerboa for now, but there are a number of issues. Can't wait for this...