Professor Whitehorn is a really great professor: clear, thoughtful, and is even available to answer questions outside of class and office hours. That said, 18L is a heavy (but not particularly hard) class (expect 6 hours for labs, 8 hours for reports, and 1 hour for lecture each week), but if you're reading this you probably have to take it anyway, so take it from the best.

Also, he grades on a straight scale, which makes your grade essentially a luck of the draw by who your TAs are. 70% lab reports (lowest dropped), 30% attendance.