Bought a 2017 CR-V at my asking price but got persuaded into buying an expensive shock-sensing car alarm ($400). The alarm can be had outside for around $200. Chen Fan's sales pitch was good though, "multi-layered security system with changing key code that integrates with factory key fob. Honda sets the alarm pricing, can't lower it." Taking two stars out due to that experience but other than that, final price was acceptable. Live and learn.
My advice to car buyers is that make sure to stick to your own price, skip the car alarm and add-ons (when you're in the finance manager's office).