Gigarouter performance

I know that these boxes work well, theorically, but I really want to know if there is any ISP using them on their core, and how many traffic it�s supporting . Another issue is, if I have 30 ATM PVC�s over an OC-12 interface, how well this box will treat each one, it will be possible to provide QoS for these PVC�s inside the box without impact the others services. Rogerio