I actually had Physics 4BL with David Bauer, but he is by far the best TA I've had for any physics class. Most of the time I sent him an email, he replied within the same day, sometimes within an hour. Also, his grading is actually fair and reasonable. For 4AL, I had Eric Kramer, who was nice enough but his grading was absurd. If you want a good grade on your lab with Kramer, you HAVE to finish it early, go to his office hours, and let him correct it for you. I had a conflict with his office hours, so I missed out on this one-on-one correction. I was only marked down on the actual content of my lab maybe once or twice; a majority of what I was marked down for was "incorrect line spacing" or "not enough tick marks on the graph". I ended up with a B- because Kramer didn't like the style of my reports. This is why Bauer is MUCH better. For one, he provided us with a style guide to follow, thus avoiding these issues in the first place. Also, whenever I asked him about the formatting issues, he response was typically "___ is what you should do, but I won't mark you down for something minor." Long story short, 4AL and 4BL are difficult classes, expect to spend about 8 hours a week on your lab report, but if you have a chance to take it with Bauer, do it.