Hi Paul. Didn't have the "Circuits & Avenues" problem with my 270 because it wasn't Text to Speech.
All the phrases were pre recorded and no street names were spoken.
The problem I found, if using a 'very foreign language' was that sometimes words were missing such as
"Turn right in (blank) feet".

Not sure what I will get back from Garmin because the Nuvi 270 is obsolete. Also the internal maps (UK, Europe,
North America & Canada -2008 versions) all fitted into the internal 3 GB whereas the 2011 maps are too big.
So unless they send me a 270 with 2008 maps, I don't know what they will do.