Yes Alt-F does work! Tested with a DNS320L, Hardware revision A3. The A3 firmware is in the experimental folder, I used this one: Alt-F-0.1RC4.1.1-DNS-320L-rev-A1A2A3.bin
I bought this NAS as a backup to my Synology NAS. I thought it was better to have a different NAS as backup in-case they get hacked or get a bad upgrade, I don't lose both at the same time.
My experience with DLink has not been good, I couldn't get rsync to work with any rsync server, the Backup services on the 320L don't seem to be RSync either. Only CIFS seems to work, and then only 1 CIF share per volume. Very frustrating interface, very shallow feature set, not a patch on a DS213, but then you pay for what you get and its a third the price.
Works nicely now I have ALT-F on it, with the following caveats.
You will lose everything after install, its a fresh start. When it reboots, the server was called DNS325, look in Windows Networks to find it, and use the web page. The web interface is basic but functional. When you make changes, be sure to go to 'settings' and click the 'SaveSettings' button. As its linux, the admin account becomes 'root'.
Took a bit of twiddling to figure out how rsync works, but it does work and work well.
For those familiar with Linux you have all the regular stuff, perl berkely, httpd, tranmission (bittorrent), cron for scheduling, ftp, dnla, iTunes server etc..
I'm looking through the Alt-F packages, lots and lots of good packages, stuff like a video thumbnail generator.
OpenVPN,PPTP, Samba, Disk encryption, Python, Roku media server, lots and lots of packages.
Missing things? Well you lose the power on off schedule, it goes into idle though.
All in all, nice. Without Alt-F distro I would have binned this product in frustration.