Professor Stone works with Sherriff and basically everything is the same, so if you check out the reviews for him you'll have a good feel for the class. Stone is a great guy and is passionate about the stuff he's teaching for this class, even though it is primarily Sherriff's course. At the end of the day you'll have a similar experience with either professor. It's a great class though and I'd recommend it even if you're BACS!