I just looked up the MX+ you mentioned and it just looks like an overpriced ELM327 adapter that can diagnose the engine control unit. You can do almost the same thing with a $15 OBD2 bluetooth adapter and Toruqe app. My issue with these is that this does not provide anything close to what the dealer level scanners can do. I have been using the YOUCANIC full system scanner on my Mazda and other vehicles and it provides dealer level functionality to all vehicle systems. Not just the engine like the MX+ does. You can clear codes from any module and view live data. Plus it has a number of other function for example such as releasing parking brakes, or ABS bleed and many other functions that you don't get with a lot of scanners. It's an investment but yet worth it as if you can avoid one trip to the dealer you probaibliy paid for it. And it has the same full system coverage for almost every other car out there. I have used it on my Mazda, MBenz, and family and friends Hondas and Toyotas.

 

I have Bosch KTS and Launch Master.
KTS is not good.
Launch is OK ( flash module, add key, adapt module )

 

This is nice unit!
I use a Snap-On Solus myself as I posted earlier in this thread.
But if I were only a DIY the KTS would have been a strong consideration!

 

I just ordered the Veepeak Mini Bluetooth OBS scanner for Android from Amazon for $15. A highly rated free Android app I installed is shown below:

I'll report back about how well this combo works by the end of March.

 

The Veepeak Mini Bluetooth OBS scanner for Android plugged into the jack on the left side under the dash. The app booted up perfectly and all readings showed up on the app within a few seconds. 90% of the functionality is available with the free version. For $5 you can lose the ads and get some additional functionality. I noticed that even individual tire pressures are accessible. Faults get linked to internet sites for more explanation of diagnostic and solution info.

 

It depends on what job, it depends on what year the Mazda is...
I have a classic OBD interface in every car, based on the ELM chip.
I use the Car Scanner app and it's ok for me, for first aid.
But, on a newer car, I had a problem with a cheap OBD ELM reader.
But I bought the V-gate Vlinker and it's a great OBD interface.
For the older Mazda, I have FORScan and Ford Focom.
On new cars, the Pass-Thru protocol is also a problem, and in such situations the new KTS Bosch is useful.