i understand the hate people have with tsfx, but please dont let small sample lead to them being crossed off the list.
if you go and you are tired and not ready to learn, you will have wasted alot of money.
if your parents just force you to go because it is the thing to do, you will have wasted alot of money.
but if you go there energised, with enough sleep, and about to listen to a lecture about a subject you enjoy, and you are pumped to start studying for, it is probably the best and most efficient way you could spend 8 hours before you start units 1/2, and 100% worth the money, especially when you throw in the notes
I went to literally every single tsfx lecture for my subjects from pre unit 1/2 to pre 3/4 exam and i can state the above with confidence from my ~30 odd experiences with tsfx LOL 
just make sure you get enough sleep! i never had a bad lecturer at tsfx (except for economics) and it is the bees knees compared to other tuition companies when it comes to the sciences.
good luck with whatever you do 
