I use the Real Gains one for a lot of calories (600 per serving). My metabolism is extremely fast and i'm naturally quite lean so it is very difficult for me to put on weight. Works well however. In the last 1-2 months put on around 4kg of muscle which for my body type is fantastic.
Where as my missus and mum take one with next to no carbs and a bunch of crap for burning fat calls.
I realise most powders/shakes/pills etc are a bit bullshit hence why I always over research everything before I do it, it's just the way I am lol.
Anyway the guy emailed me last night regarding bringing stuff into Australia. He said what he normally does is supply the paperwork (COa certificates) before sending it so you can make sure with customs it will be fine to clear. Might look into this some more.