Best tool or application to get the details about CPU, Connections, utilization from F5's ?

I'm using graphite as backend to store all performance data of my bigIPs (not only system level, but also virtuals, pools, ssl profiles and so on) and grafana as frontend, which provides a very sophisticated, modern interface. I'm totally happy with that. Polling is done via a self written python script that uses iControl REST instead of SNMP, but you could also use collectd or such. If you want to know more about that, let me know, I'll happily share some details with you.