Have the owner/dealer walk you through all the electronics on the car. I was relatively new to the SHO scene and got a 2015 but I didn't test drive the vehicle long enough to see some of the sensor warnings (for collision detection failure) come on. The button for the automatic rear shade doesn't work or the shade has trouble raising up but I tinted the windows so it's irrelevant to me. Reason I bought the car was that it had under 20K miles on it (back in 2019) and it had the right combination of color/wheels I was looking for. Chicago Assembly had worked out a decent amount of the bugs in it too. Coming from the Thunderbird community (I had two MN-12s) this was the closest I could get to a larger high performance vehicle (didn't want to be like the thousands of Mustang owners).
At 40,000 miles now, it's been a rock solid car. I believe I only spent about $1,200 to fix the sensor, change the rotor/pads and the various oil changes and then ~$800 for new tires recently. You can always turn the sensor warnings off manually every time you drive the car or get a tune to, but I find them somewhat useful 20-30% of the time.
This forum is also a great haven of knowledgeable people who will help you get the most enjoyment out of your car.