How is it going with your aerobar riding?
I just wanted to put in my 2c about rollers - ones that can move fore and aft are easier. The parabolic as someone else here has pointed out does not make it any easier than regular. I have a pair of cheap Nashbar rollers and I built it a frame and attached roller blade wheels and bungee cords. This actually does make it easier to ride them. The pic is only a prop! I have yet to muster the courage to get on them on my tri bike. I do ride them on my road bike from time to time.
Keep practicing, and you will get better!
Two wheels good. Four wheels bad.