I just got mine installed a couple of days ago and went with the pass through sensors. Now I kind of wish I hadn't. They don't leak, but they really slow down filling the tires because they don't pass gas (HAR) very quickly. There is a lot of restriction when trying to add air to the tire. They make checking the tire pressure easy, but it is quicker to remove the sensor, add air, and then put the sensor back on than to add air through the sensor. If you're only adding a couple of lbs. then it isn't too bad, but anything over 5 PSI is a slow process.
That being said, it is a great system and super easy to set up. I love it so far.