Most budgies like the hammock when they are little. When they are older they grow out of it. Not literally, but mentally.
And if you have one of more female budgies, I wouldnt recoomend them anyway. The females look at the hammock as a nesting opportunity. This could start hormones going haywire whith all the annoying results. Fight among the birds, snippy to the owners, and even egglaying or breeding.
Kika: Senegal Parrot.
Guus: Cockatiel, Yellowcheek, cinnamon, pearl, pied.