We have three birdbaths in our bush garden, but the 12 or so Galahs that visit, always prefer the blue ceramic birdbath. Maybe it's the easier to grab the rim?
Usually they only stay about ten seconds, just long enough to get a good drink.
For wild birds they are quite freindly and will let you sit within ten feet of them!
A Red Wattlebird looks indignant when the big and noisy Galahs turn up. Most of the time he's busy chasing away the smaller honeyeaters, such as New Hollands and Browns, from nectar rich Grevillias in the garden.
Four Galahs at a time are the limit for this birdbath, so three is quite comfortable. I have seen more trying to land at times, only to end up knocking the others off into the bushes.
My wife and I always get excited when we see these wild beautiful birds in our garden and think how lucky we are to have them visit.