Short answer: I've got one sitting behind the TV in my parents' kitchen, running ssh and openvpn for proxy/vpn purposes, but mostly working as an automated BBC

Short answer: I've got one sitting behind the TV in my parents' kitchen, running ssh and openvpn for proxy/vpn purposes, but mostly working as an automated BBC TV downloader, scripted to download a list of shows every night, at different qualities (e.g. don't need high frame rate for quiz shows), rsync them to my server at home outside the UK, and send me a PushBullet message to tell me what will be available to watch over breakfast. Works beautifully! I'm very tempted to get a 4 and pair it with a lower-specced NAS for home server purposes - I don't think even the Pi 4 has quite the I/O to be a great storage server by itself, but that combo is probably more fun and flexible than just a NAS alone...