Not really that much a bother, to be honest. Inability to load an older state and redo some story choices can be much more troublesome at times. Still, with a story (or stories, really) this good, I can live with that as well. As evidenced by the fact that I have finished the original three chapters with all 8 classes and I'm still playing it now, making my way through chapter 1 with a 9th character (and have quite a few more waiting).