I am running Jcards Alt-F 0.1B7 since a few days and I 've won the following experiences so far:
- a little more complicated web interface (you must read and understand what you want to do)
- much more and detailed adjustment options
- wide variety of usable file formats, even interchangeable (ext2 to ext4, convertible)
- nice Samba and nfs integration
- powerful user and directory management
- better energy options (now I cannot even hear my DNS-323 when it is n sleep mode)
- great choice of installable packages (from funplug and Alt-F)
- overall a lot more features than from DLink
- up to date kernel compared to DLink version
The author jcard has already announced a version with GPT handling. This means that the DNS-323 can handle hdds > 2 TB

) I can say the firmware is more reliable as the latest beta from DLink and as stable as the actual stable version 1.09.
Thank you Jcard, shame on you DLink.
Regards
t_1967