As an update I received a very professional reply to an email with some questions.
They currently use Allegan's Juvederm Voluma with a Blunt tip micro cannula and expect about half of it to be there at about the 2 year mark.
I wish it hadn't gone pear shaped with them in the BBC thread as they seem very solid.
or in fact any who had work done by
Horn some member feedback would be invaluable.