The cast was fantastic! Weirdly the 3 wicked witches somehow became an old lady, an old dude and a young guy who reminded me of Frank Woodley, but that actually worked pretty well (although it took me a little while to figure out what was going on). It also took a while to get the ear used to Shakespeare's English, but once I got into it I thoroughly enjoyed the show. Lighting and sound were used to great effect, as was fake blood.
I hadn't read any Shakespeare since High School, but this has really whet my appetite for more plays. I thoroughly recommend you get your butts there. One tip - take a pillow and a warm jacket; the usually balmy Queensland weather didn't want to play tonight and turned cold and windy.
In the area in front of the Powerhouse there was some kind SciFi-ish milk crate spherical structure that begged to be photographed: