When I was working for Honda a few years ago, they told us to avoid the Nitrogen fills because some of the poor quality systems were not getting all the moisture out causing the TPMS sensors to rust and ruining the sensors. If you didn't know, TPMS was required by the Feds on every car 08 and newer if I am not mistaken so if you haven't invested in the computer software/hardware to work on these systems, you will have to soon enough. I have started looking myself for the best option for me.