I'd heard Sync can be problematic.
As of 2012, the Titaniums came with a Sony headunit with DAB fitted as well as bluetooth... the pre-2013 still makes calls, plays music, have voice control - and adjusts your climate control!
So... a 2010/11 Fiesta with Bluetooth will do everything a 2012 with Bluetooth can do? Except that the 2012 has Sony DAB?
Also, how does sat-nav work... I think the 2013 can have a 'Sony Navigation system', can previous Fiestas have any kind of built in sat-nav?