I married into an '09 and it was a nice reliable 30mpg (no matter how we drove) car but the excitement level was tepid at best so it was nice to trade it in on our '12 SE and it's a completely different driving experience with the MKIII. Problems? Most of them are associated with the DCT and the MFT system which we have neither.
We had 32k on the car when we traded it in and got almost $11k for it and not one problem with it.
'12 Focus Red Candy SE Sport 5 spd
'99 Toyota 4Runner Sport
'11 Subaru WRX STI Hatch