I've been using SL from day one. I like it! My prof will be talking about one case, and than mention something about another, than come back to the first case. Storelaw gives me the ability to just go to that case in a second and make the extra note. I also like being able to make an outline with what I want.
There are negatives though... most of which have been mentioned (dictionary, bind keys, slow tech support), but as a whole, I find the benefits outweigh the negatives.
I see ppl using WORD all the time, and they have a seperate file for every case, or for every class. That would be an organizing nitemare for me. I like things organized, and easy to find. You can't beat SL in this area.... and that is the trump all of the negatives (for me).