The only Fusion I would buy is the 600.
The 900 and 700 had lots of problems, I drove a 900 but it had a bad vibration, thank god I did not buy one lots of problems the dealer said.
Dad had a 600 fusion it was ok but no great.
He bought a 600 IQ 2 years latter it handled much better.
The IQ is better with fewer parts and handles better.