Can't speak about the power given on their $400/mo cabinet deal.
The R520 runs Proxmox and hosts whatever stuff I’m playing with at any given time along with Kubernetes, FreeIPA, Graylog2, probably my mailserver again soon, etc.
One R210 II runs Sophos XG to handle router+security duties, the other runs Windows Server Essentials 2016 for AD and NPS.
The CRS317 switch provides 10Gb networking for storage on a couple of servers, and everything else is connected to the EX2200.
The servers cost me $1200-$2200 each and I would buy a new one every quarter until I got to where I am today. I haven't added new hardware for almost 2 years, but its more than capable of handling my workloads (mostly web apps, lots of servers satisfying sql,ldap,etc dependencies). I burst (and failover) to all the clouds today.
Link?...