Its what I expected it to be too.
Writes at up to 30 Mbps, reads at 45 Mbps with two 1.5 TB Seagate Barracudas in Raid 1. Runs at 35 degrees C with the drives working. (not just idling.)
The firmware (now running 1.02) has a new layout. It looks like a GUI with icons for each group of options which are grouped into three categories, Favorites, Applications, and Management. Some people don't care for the look of it but I don't mind it at all.
-Download files directly to the NAS.
-Backups can be scheduled both local and remote. A single license for Total Recovery Pro for Windows is included with the software.
-P2P - Torrent downloading and seeding.
-Web file server.
-Amazon S3 backup.
Any of these can be moved to the favorites page for quick access.
Along with all this there are "add ons" like a blog server, Squeeze Center, Audio Streamer, AjaXplorer, Photo Center, aMule, and language packs. I am running Squeeze Center and have no issues with it but it is an older version, 7.5.3 to be exact. Installation involved installing the add on, then following a link provided to the tar file and downloading it to Volume 1 of the NAS then restarting the Add On installation.
Other features include FTP Server, NFS Service, AFP Service, Time Machine compatibility, iTunes Server, UPNP/DLNA Server (no transcoding - yet), ISO mounter, and Power settings including a Power Off setting settable by day and time.
Now the bad:
Documentation is thin at best, especially for add ons. Most of the setup tasks are simple enough to figure out but the total lack of documentation for the add-ons is pretty sad. A little Googling and you can figure most of them out but there should be documentation available with the Add On or a least a link to some documentation.
Forget moving drives from your old 323 to this unit. Format is one reason, and the OS is the other. The OS is written from the firmware to a hidden folder on the drive during formating and it appears there are some problems around doing that on existing drives at this point. There are indications you can in theory break your 323 array, move a drive, copy data from the 323 to the 325 then recreate the array. I never cared for theory though...
The good far outweighs the bad for me.
Shutting down a PC and running Squeeze Center on a 23 Watt device will save a few bucks on electricity.
File transfers are now reasonably fast and I can stream dvd quality video to my O!play and Flac to both Squeezeboxes all at the same time.
The many options available and the lowish price ($180 at Memory Express) and the ability to up the drive size to 3TB per drive once drive prices come back to reasonable will add to the usefulness. As will Dlink if past performance indicates. The usefulness of the 323 was expanded through its lifespan and I expect the 325 to get the same attention.