Depends, I found the C7 rather underpowered for its WiFi capabilities, it fell WELL short of what speed you should get on 802.11ac. My speed about doubled (WiFi to LAN) when I switched to the nanoHD and was far more consistent.
I do agree though, if its working okay I don't think its a good time to upgrade. Wait until final specification WiFi 6 kit comes out, or better still, WiFi 6e. Although personally, I'd always advise to use a separate router and WiFi Access Point anyway, for optimal positioning and performance.