I just received my Vero 4K today so have not tested yet, but this week I was testing high bit rate stuff (60GB HEVC movie) from my Nvidia Shield/SPMC and I did not know at the time but the wire connection was at 100Mbps (because of a bad cable from the router to the switch!) and there was buffering in this specific movie. Other HEVC movies at ~20GB were running fine.
So when I switched the bad network cable to a good one, and I could reach speeds of ~50MB/s through the switch (still far from that gigabit eh!) and there was no buffering anymore from my Nvidia Shield.
Luckily I have a USB3/gigabit connector already, so I’ll be using that on the Vero 4K. Bottom line is YES, definitely get and use the adapter, because it might come in handy in some circumstances with high bit rate stuff.
EDIT: Just read about the other solution of mounting through fstab. It might work but I definitely prefer to have a real gigabit connection than having to fiddle with the OS. The connector is only CAD$20 so worth it for me.