Just a few reminders.
If you set up the account before 10am, it'll be active by 4pm that day. Anytime after 10am, it'll be active by 6am the following day. I had a heck of a time setting it, even had a couple calls dropped right near the end. I already had it in the windshield and Kari needed it to get home. The guy told me, that if you go through the sun pass lane, it'll take a picture of your tag, then cross refrence it to all accounts, if one in found, then it'll come off your account. And you won't see anything differently.
The min set up is 10$. And you can only add from a start of 10$. If you do the automatic payments, if your account is at 5.00$ it'll charge 10$ to your CC or how ever much you set it up at. Problably not a good idea if you're not going to using the roads often.
The online payment is easy, and it shows you every use and how much the toll was. So you might want to start off online checking your routes and how much the tolls are. Then when you set it up, give yourself about an extra 5$. And don't do the automatic payments. Put a little sticky on your dash some place and mark how many tolls you go through, and for how much. Then at night you can check it against your account by calling or going online.
The one frustrating part is, with the mini stuck to your windshield, if you ever go through a toll and you know there's not enough in the account, it'll still let you pass. If you pay the toll, then you have to send in your reciept and all this other hassle to prove you paid it. One night when I knew the account was low, but didn't know the balance, I waited to go through the toll to pay the lady, and when I got up there, the transponder hit the mini and turned the light green. When I got home and check... my account was under like 2$.