Do it Weasel! Bite the Brix bullet. I crinched some numbers and worked out that even with shipping to Aus (which adds another 80% to the cost) it is going to be way cheaper over time to use the kit than to try to do Brix or LOS on my own, sourcing amendments etc. Plus - all the hard work of working out the levels and schedule for feeding the soil has been done. Plus - Sativas like you seem to like to grow do awesome in it... I don’t see that you could possibly go wrong! It actually seems like something of an ‘anti-club’ to me. Hey - they kind of let me in and I don’t even have a kit... yet