To be honest there's virtually no difference between them performance wise except I'd say the PMDX is much better BOB and Steve stallings is very good with support as is Peter Homann so in your case being in OZ I'd stay with the ESS + PMDX. Worst thing about the ESS is Greg at Warp9 won't fix things that should be fixed or if he does it takes an age and lot of shouting.