To all those people posting regarding Qlink calls on Centre frequency, I thought I'd add my two cents:
I appreciate people who do make those calls, frequency chatter permitting - I routinely fly VFR in Class E airspace at relatively high levels (A085, A095) and monitor centre frequency to maintain situational awareness. If for whatever reason I'm not also monitoring the applicable CTAF frequency it's very helpful to know where these guys are. On a few occasions it has helped avoid TCAS warnings and traffic conflicts with E-jets, Dash 8s and B1900s on descent as I am transitting in the area of a busy CTAF at these levels.
I feel that anything that even has the potential to increase everyone's general situational awareness can only be a good thing. Please keep in mind though that as I stated, I support the idea that it should be as appropriate and when prudent if the frequency is particularly busy.