hmm. I went and didn't mind. Good quick revision, and mum was more than willing to pay for them (her part in helping me get my uai or something hah). Pricey tho.... 3x $300
Unless u have parents who want to pay for them, dont bother. Tho maths is worth it, if your average to good to quite good. If you suck, then it wont help, and if you own at it, it wont help. Physics was dodgy, half of the lectureres sucked. English was good..... some of them were great, lots of notes... lots and lots and lots and a damn tired arm! (hsc warm up lol). No IPT or SDD
So yeah if ur parents wanna do it, go for it. Else, dont worry. Also remember, the ones just b4 ur trials take out time of ur study! Dont waste it. Like a week take or something. Tho the pre-HSC ones only go for 3 days, much better... compact.