“Ethernet port uses the Realtek chipset which does not yet work with RISC OS on the Raspberry Pi. Do not buy if you want something to connect RISC OS on a Pi Zero. Otherwise OK.”
“This hub let me set up my Raspbery Pi zero with minmal effort and old kit I had to hand. Pi Hut support have been very quick and helpful answering my question about the barrel socket on the version delivered to me. They tell me it is a 5v power socket which may prove a bonus for future projects using ethernet, disk powered from USB or other devices. If this feature is important to you, I suggest you check whether it is on version in stock.”