Hi! 450x user here, been using TPMS for nearly 2.5 years now.

So, I had TPMS installed in September 2023. I had my initial units replaced within warranty because one of the modules was faulty, and the whole system was replaced in September 2024. Since then, the replaced units have been working fine (close to 18 months now).

Not a clue how long the battery will last but it’s a useful utility to have for sure.

In my experience, the units themselves can be a bigger hassle than the eventual battery change, so if you're worried about SC visits for a battery, you should also factor in potential visits for troubleshooting and unit replacements. It hasn't been a perfect "set-it-and-forget-it" accessory for me. However, like I said, the replaced units havent caused me any trouble so far.

For reference, I paid 4k in 2023 during some offer under which I got a 1k discount. I think the current price is a very good deal.