It's funny reading this thread because people are watching all different episodes at all different times. Also, I'd never trust what anyone says until I see it happen
I'm watching it in the UK on Channel 5 and it's really addicitve!
I think the dual illegal/legal escape story is good, although I don't know what would happen if Lincoln got pardoned and Michael was left in there anyway
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The last episode was weird but quite good; it was the back story one. The only thing I didn't like was the way that as Lincoln ran away from the shooting he just happened to bump into Sucre. That was obviously just to make the series self-contained, unless it becomes more relevant later (Sucre gave evidence anonymously or something, though I think that's unlikely).
Obviously it can only run for 1 Series/'Season' in its current format; I personally doubt that they will do an 'on the run' bit. The main problem is that whatever happens Michael is still in prison for a crime he did commit, even if it was intentional!
Anyway, this post is way too long so I'm going to stop now!