Bluetooth OBD2 Diagnostic Scanner - worth having?

[L22]

Hi mga peeps, has anyone tried using a similar device?

Found it very affordable, price range only PhP 800 to around PhP 2000. There are many sellers in OLX.

Some Features:
Depending on the application,
the following features may be available through a smart phone interface:
Check Engine Diagnostics
Real-time gauges
Fuel Efficiency and MPG
Engine Sensors
Customizable Dashboard
Real-time Dyno
Data Logging
GPS Track Mapping
Skid Pad

Would there be issues with the vehicle warranty if installed? How about accuracy of results?

Please indicate vehicle type and model for those who have tried it. This will be useful for us who might find this devise interesting and worth having. Thanks