If you have an HDT, it's important to place your transponder near the bottom of the windshield, or your visor may block it. I have colleagues who've been charged large amounts by NY for misreads. If you don't have a visor, no problem. Also, you no longer need a Sunpass for FL, your EZPass will now work there as well. A transponder will make your life dramatically easier if you visit NYC, Chicago, or the Northeast. There are virtually no cash booths there anymore. Chicago in particular, puts the onus on the driver to blindly figure out how much they owe for each toll gate and voluntarily submit it. Jay