I only went there for spesh so that's the only course of his I can comment on. The reason why he only lets the top students in is because his place isn't designed to help the lower students get better; there's enough tutoring places which do that already. His aim is to help the potential 45's reach the 50's and so on, and this is easily reflected in his homework. Some of my friends who joined earlier ended up quitting in VCE because they simply couldn't cope with the homework and basically, if you can't pass the entrance exam, you really shouldn't be there anyway because you'll get nothing out of it since you'll just be completely lost every week. Even if you're willing to learn, weaker students just won't be able to cope because his homework is beyond mere textbook stuff. Overall, his stuff is ridiculously hard, but yeh, its basically all in training for the final exam. I can comfortably say his trial exams are definitely the hardest I've done (I've gotten 90%+ on every MHS SAC but I've averaged around 60% on this guy's trial exams; they're seriously nuts) and yeh, it's good stress prep for the exam really.
As for price, he's pretty cheap; $25 for 1 and a half hours or so. And yes I had to sit the test, but if you've done methods already, I doubt it'll be much of a problem. There's just a few ugly questions which involve problem solving (think Westpac) but there's really nothing you can do to prepare for these.