Liza,
I think that the Blackburn trainer that you're considering has the centrifugal clutch resistance unit that the 1upusa trainer has.
I don't have any experience with the Blackburn trainer, but I have owned the 1upusa trainer for about a year and have about 1000 miles on it. I've been using it about 4 days a week to train for the AIDS/Lifecycle ride, and it's been great. It's really easy to get the bike setup on it and then take it apart. Save for the tire squeak, the trainer itself is very quiet. As far as resistance goes, I find that it's much easier to ride at a certain speed outside than it is on my trainer -- I don't feel cheated during my workouts. On the other hand, the resistance isn't so high that I can't warmup decently.
-- Melissa
I'll get back on the bike soon, I promise!