Yes, although I've never heard Geoff's lectures, I've heard he is extremely good. Also, Dr. Greg Wilmoth is a top Physics teacher as well. Knows his material and can really communicate and connect with the students. I, especially love the way he communicates, he shows a lot of enthusiasm and it's impossible to fall asleep while he's teaching.
The exam tips that TSFX gives you is unparalled because a lot of the teachers at TSFX are examiners and/or extremely experienced VCE teachers.
I've been to TSFX's Master Classes this year and did Methods and Physics and enjoyed it very much. I was able to make friends and for some of them, TSFX served as excellent revision, while others learnt the material from TSFX for the first time and then their usual day-school lessons as revision. Either way, it's beneficial for your studies.