You should really be using fiber by the time you hit 10gig.
/M
I know, I'm mostly using DAC cables and LC uplinks because it's used as kind of "top-of-rack" switch interconnecting servers. Unfortunately one server has 10G copper onboard NIC. It'd be a bit of waste not to use it and our firewall will definitely struggle with 1500 frames on performance level, it hardly keeps up with 9k frames at full 10G already. On the other hand it just feels wrong to pay more for single sfp module than for entire switch lol...