Troubleshooting 10Gb/sec connectivity problems. Is it the router, is it the switch, is it the SFP+ ethernet enclosure, is it the cable, is it the network card on the client.. etc etc
A lot of the tech is quite cutting edge and the cheaper stuff doesn't always work very well together. I don't have a ton of money so I have to troubleshoot instead of upgrade.
Mikrotik do inexpensive routers and their RouterOS is wonderful.
It can even do connection-based load balancing over two connections, although I don't have the mastery to set this up yet.