I have 6 x CCR1036-8G-2S+ I run them at 3 site, in vrrp mode.. But no BGP, only OSPF.. like them except I had reproblems pushing a single tcp stream past 1G, some limit in the cpu / nic setup. I could easily push 9.8Gb's on UDP.
I have 4 x routeros x86, running as VM's, 2 with BGP taking full feeds from 5 different peers (I am not transit, end user). The load up took time as noted, but they have been running fine, I actually have them doing BFP -> OSPF as my asa5520 doesn't do BGP
that works well as well.
My other 2 vm's do BGP but much smaller tables.
The throughput is very minimal 10-20Mbs. I have spiked to 100Mbs. I had tested up to 1Gb/s
Overall Nice device, cheap, i like the BGP filter setup. I haven't run into any long standing bugs. I had issue with LACP but fixed with 6.12.
Currently running 6.15 on 80% of routers.