I did start S142, but dropped it as I changed direction on to OpenPlus (chemistry at uni of Reading) xD
My only beef with it was that the final book (microbiology) is only available online. You don't get an actual book. :/
Then again; my current course, S215, is also entirely online.. why are they doing this?! lol!
If you're doing biology, then yeah, as two of those books are heavy on biology subjects.