Another similar product is ZigStar LAN Gateway
https://zig-star.com/projects/zigbee-gw-lan/
https://community.home-assistant.io/t/zigstar-zigbee-coordinators-and-routers/338586
No such known issues with latest firmware, but yes you will need to upgrade the firmware regardless.
Yes you can but it has a Silicon Labs chip so not recommended if ever want to try Zigbee2MQTT later. Function-wise it would once hacked work similar to Tube’s Gateways and ZigStar LAN Gateway.
Still, I would not recommend something that requires hacking for first time setup when a USB is very cheap and can be re-purposed as a Zigbee Router with different firmware if want to upgrade later.