Has anybody dealt with this firm? They advertise a lot in Flight and other sites but they seem to be very secretive about their services. After I applied for a position they advertised, there was nothing but silence. Now, I know its entirely possible that I may not be qualified for a specific position

improbable as that seems, but does anyone have anything positive to say about them?
Are these recruitment firms, Betts specifically but any others as well, worth spending the time with?