The 9500i and 9500xi both can remove false signal by GPS, so your friend that has one has no idea how to use his radar. To get rid of a false alarm forever, push the silent button 3x and its gone forever.
I drive 80% highway 20% city. Which isnt a small city by any means. They both hardwire the same, they both operate essentially the same. The 9500 has the upside of removing false alarms in 2 ways. You can do it yourself with the silent button, or after x amount of times if the radar is seen as a non threat it will remove it. As well on the fly you can mark normal speed traps so you have that reminder.
Both great radars, your not losing with either one.