Who has a 825 S4?

hi guys
I have a 2009 620i that we bought new. it has been a good farm rig for us. we have 3 kids now so we are looking to get an S4. I'm looking at the 825 S4. new is an option but I'd like to find a decent used one.

there is a 2013 825i s4 for 11k . wondering what folks thought of this machine in the 2013 model year.

any other insights and experiences with the S4 gassers would be appreciated.

thanks