I haven't been, but I'm good friends with one of the owners. They specialised in their respective fields at university, which is a big plus considering many tutors/teachers at tuition colleges were in degrees that were completely irrelevant to what they're teaching. The reason they only tutor HSC Phys and Chem (and not other subjects like math) is because they prefer to be specialist educators in these areas, as opposed to being the generic tutoring college that offers a broad range of subjects from Y7-12.
You can always book a trial lesson if you want to test the waters.