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Be aware that they impose a continuous battery drain, small but not insignificant.

Also if you are an iThing user, Apple's bluetooth stack does NOT play nicely with data devices such as OBD2 transceivers. For iDevices the Wifi versions are the way to go.

I tried one of these on a BF2 Falcon and it was my impression that battery drain because of it was a part cause of issues I had that seemed to stop when I removed it.
Additionally, as my smart phone (Android) was also used a lot for EOTopo maps, phone calls via Bluetooth and Google Maps at times there were too many things trying to run at the same time and switching screens was troublesome and in some ways illegal while driving.

I now have a Scangauge and with the bonus of getting it to read the Transmission temperature on our Ranger PX1. With all the Ranger issues that can affect battery drain I wouldn't try the Bluetooth adaptors again.

BTW, I'd be careful and remove any of these when taking a vehicle in for factory servicing, especially while under Warranty. A couple of years ago I had a discussion with a Dealer Workshop person and it was commented on that these type of things connected to the OBD2 port could possibly affect the electronics and void the Warranty. True or not I wouldn't give them extra ammunition to try and weasel out of their obligations. I've already experienced them trying to find evidence to void a Warranty due to non-factory accessories.

Interesting. I was advised by the service manager at Mazda to get one to help diagnose an intermittent issue I had when starting on cold mornings.

Hoyks, thanks for the link. It is much more helpful than the lazy "ELM 327 - $15 on Ebay including delivery ."