The cars have been very reliable. The main issue that people report is relatively minor, the HVAC actuators have little plastic gears in them that strip out and start making a whacking noise. They need to be replaced when that happens but it's not a big or expensive repair.
There was a recall for some of the 14 and 15 models for a possible leak in the cylinder head. If you're looking at one of those years you should check and see if they are subject to the recall or if it has been done. The fix was somewhat of a Band-Aid, just a new coolant tank and sensor.
Here's a thread I started which covers changes and improvements through the years as its title says. The cars were quite similar through the model run. If you get a 16 model year on up, you can avoid the possible recall, get the updated Sync 3 screen system, and get a slightly softer suspension-
https://www.fiestastforum.com/threa...-improvements-to-fist-through-the-years.9186/