My org only works inbound leads generated by marketing. These are 30 day trials and our SDR's qualify them before passing them to AE's. No outbound. Ever.
I've started doing my own outbound so I can be in control of who I speak with. Also, marketing and SDR's let us down big time every now and then when they miss their targets.
Curious to hear what the mix of inbound/outbound is in other orgs!