I have to say that I have been using the Ticonderoga Blacks for the past week and I am really enjoying them. Oddly, I find that my LG diagramming has been MUCH neater since I began using them -- odd. Anyway, I feel more comfortable writing with these pencils and that is enough to convert me.
Obviously, I don't expect any sort of score increase merely form pencil choice, but just like doctors and waiters give thought to their shoe choice, LSAT preppers may consider giving thought to their pencil choice. : )