"He's been a bit of a revelation the horse.
"He's in the right stable and might have taken a bit of time to acclimatise, but he's a very relaxed customer.
"He takes a bit of waking up but the ability is certainly there."
Birdman came to Australia having raced over 2400m and further in Ireland, but Waller has transformed the gelding this campaign to being a bit sharper.
And Melham said that may be the case with the gelding having more speed and may he be better when kept a fraction on the fresh side.
"I don't think the run will have hurt him at all," Melham said.
"He just got into a lovely position, didn't sort of spend any pennies until the last 250 metres and I felt he had the race at his mercy a long way out.
"He seems to be going really well at these shorter trips. He'll be no worries at 2000 (metres), but maybe that's the way to go with him, a bit of freshness in his legs, but I'll leave that to the expert."