When it comes to soundproofing a ceiling it is essential you consider both issues that need resolving: impact sound and airborne sound.
For those who are budget conscious, the ceiling hangers are an excellent choice in cases where you are able to lose 85mm-91mm (about 3 inches) of ceiling height. It is not an intrusive method of sound insulating your ceiling, as it is relatively mess free. This is because you usually retain your existing ceiling. This is particularly the case where you have existing lath and plaster ceilings and don't want the mess of removing the old ceiling.
The Acoustic Hanger is part of a Regulation E system for flat conversions. The full solution can be found at www.uksoundproofing.co.uk