I think this definitely depends on the subject but overall Checkpoints may be a good investment. They get a lot of disses for being what kind of looks like just expensively repackaged VCAA questions, but do actually contain a lot of original questions.
I think the great thing about them is that Checkpoints are all organised by AOS and topics; a massive time saver when preparing for SACs, which is honestly also where the value for money comes from. Personally, I used them throughout VCE and whilst I didn't do every question (and avoided some of the 2018-present ones until exam prep), I found the inclusion of student stats and overall format very useful. Particularly for Methods, I'd probably recommend getting them to get in that exam practice throughout the year.