scopesnc Ethernet ports don't usually run at 300Mbps, perhaps that's the WiFi speed which is reasonable.
The Ethernet port on the Pro is rock solid if you connect it to your home router.
I have a GL.Inet Slate which is connected using an Ethernet cable to a Pro and it works quite well, I still get a few disconnects but nothing like when I was using the WiFi from the Pro to connect to my home WiFi repeater just a few metres away. The Slate signal is good enough for it to connect directly to my WiFi router without the need for the extra repeater.