On sale is the bigger brother of the F4-423 NAS with a few improvements. This includes the faster Intel N95 CPU, 8GB DDR5 RAM (upgradeable to 32GB), a USB-C port and a new black design.
These are great for all the essentials including network storage with RAID redundancy, Plex transcoding, Docker, video surveillance, syncing to OneDrive/Google Drive/Dropbox and more. While the OS isn't as mature as others you can still others including Synology DSM (Xpenology), Unraid, TrueNAS, Windows and more.
Other features include 4 SATA bays, 2x M.2 2280 NVMe slots for storage/cache, 2x 2.5GbE LAN ports, USB 3.2 Gen2 10Gbps USB-A & USB-C ports and HDMI (for command input).
Just fyi the pro model usually around $850 ish (when on sale, amazon) if you need more powerful processor