I use my EZPass 8 times a day (4 to work, 4 on the way home). Inside the windshield just behind the mirror (out of sight unless I look for it) works just fine. Besides, they had my license plate wrong and sent me a series of tickets for various times I passed through and the tag didn't take. I straightened the license plate out, and haven't seen a ticket since. If the tag doesn't take, and they look at the photo of your truck for the plate, they will run it through their database first to see if you have a valid tag, and apply the toll to your account. If you get too many, they will contact you to get a new tag.
I figure it takes me $7 a day for tolls, but it's either that and a 45-60 min. drive each way, or free and 2 hours each way. My time with my family is worth more than that.