I removed the original non-MFSW from my 2010 Jetta SE and replaced it with a MFSW w/ paddle shifters from a 2009 Passat CC. I also replaced the original Steering Wheel Control Module (SWCM) with a 1K0-953-549-CD (it was a 1K0-953-549-CP). Which SWCM you use depends on your vehicle - the dealer can look this up in ETKA.
The paddles work, BTW, shifting the Tiptronic just as described in the manual. But keep in mind that the MFSW came from a 2009 Passat CC which had Tiptronic, not DSG. Then again, this may be irrelevant.
I haven't tried the "UK English". That's a good idea!
EDIT 7/1/2010...Yes, the UK English speaking voice does say "Phone" and "Phonebook" correctly...both when the words are in my phonebook and when reading the system's own Help menu. But interestingly, many other words are pronounce oddly. For example, my spouse's name is "Sheila" and the US English pronunciation of that word is just fine. But the UK pronunciation is almost unintelligible.
Providing your phone can link its phonebook to the NAV system and/or the MFD+ it is worth the upgrade. If the phone's bluetooth set-up won't do this (my spouse's TracFone won't...they locked out the feature) then you only gain PTT via the MFSW, voice commands, and the ability to speak a telephone number. Such a crippled bluetooth phone/music player will not allow music streaming via A2DP or phonebook download to the RNS-510 or MFD+. You do get handsfree dialing and conversation.
If you do have the RNS-510 an "EXTRAS" pop-up menu lets you mute your end of the conversation and/or switch in and out of handsfree mode to give you more privacy. The MFSW buttons allows you to switch in and out of handsfree mode, too. The EXTRAS menu on the RNS-510 also has a selection for "Conference Details" that apparently lets you use your phone's conference call capabilities while displaying some info on the RNS-510...perhaps dropping one or the other of the calls. I haven't tried this feature.
Within the RNS-510, each linked/paired phone is given its own 6 memory directory. You put these phone numbers and names in the RNS-510 manually or read them from your phonebook. One of the memory locations is taken from the linked phone, if possible...it's called "Mobile Box" and appears to default to your phone's "Voicemail" by name, but you can change the number. You cannot, however, change the name showing on the RNS-510's 6 memory screen from the default "Mobile Box". The system automatically brings up the specific memory group of 6 depending on which phone is currently linked to the system. Up to 4 phones can be paired, but only one is linked at a time.
The dealers simply have to order the part. They'll never stock it. I ordered mine from Keffer VW in North Carolina on 4/29/2010. It took four weeks to arrive and 3 - 5 minutes to install. The dealer had no previous experience with the part number until I asked them to get the part.