Absolutely delighted! The only snag is that you need to use the super-poussin (Netgear forum user) addon version of TMS5.0.55 as the current one listed on the PV site creates the Twonky database within the Twonky installation directory in the OS partition. As the OS partition is quite small, any more than a few thousand music tracks swells the database to a size which fills the OS partition and 'breaks' the NAS. As there's no space left, you'd be unable to even install the enable SSH access addon in order to delete these files.
The super-poussin addon version of TMS5.0.55 is great and works really well as it installs Twonky in a folder (/c/webroot) on the main partition, but the only downside is that every time you do a TMS database rebuild, it somehow causes Twonky to archive the old database files. Unless you use SSH access to delete these archives, they will eventually grow to a very large size. The issue with size is due to the large number of small files in the TMS5 database, and also due to Netgear for using 16k block size formatting (i.e. everything uses a minimum of 16k). With my 15,000 FLAC files, the database uses 2.7G of disk space; the archives are not much smaller, so without manually deleting them, they would eventually gobble up a lot of disk space.