I have just gotten back from training trip to Melbourne, Australia. I was privileged to train with 4 of the best BJJ black belts in Australia, Lachy Giles, Alex Santos, Dave Hart and John Simon.
All of these men taught me some great new concepts and gave more of themselves than just time.
I spent time learning the latest in guard technique as well as solid passing. In particular I have learnt a lot about berimbolo, single leg x guard, de la Riva, and reverse de la Riva. I also learnt done great concepts for dealing with both open and closed guards.
I can't recommend these guys highly enough and I am sure you will agree if you goo and train with them. When you are next in Melbourne make sure you call into renegade MMA, Melbourne martial arts or dominance MMA.