Yea, it's pretty cool, specially since everything is fully customized. The app is a real deal not a toy as some of the apps are. It even has engine service reminder, as it gets closer to oil change it will remind and speak out the service is getting closer or due. The service mileage is adjustable, I set my to 5000 miles.
Over the weekend I play with 4 different OBD2 adapters, I tested them all and in every single one the RPM always had delay, some less then the others but it was either jumpy or it would studded or always few milliseconds behind. In my Jetta that is all canbus it was not as bad. On NSX it was worst and it would eat on me in long run for sure, I even try usb to serial adapter on Android and eliminated bluetooth all together. From my tests that I done the delay issue is not related to bluetooth adapter at all but I narrow it down to slowness how fast the ECU can send the data. The OEM ECU sends the data very slow and it's the buttleneck and not the obd2 adapter for sure.
My dashbox arrived and I just connected rpm signal directly from the cluster and it' reads super super fast zero delay, it reads RPM's butter smooth and it can display the RPM faster then the old needle could move, LOL. The "Dashbox" module is def the way to go, it connects over bluetooth but the sensors connect directly to it. It has 16 inputs to integrate indicator lights and gauges. Since I keep 4 original needle gauges it leaves me with more to use. The support from "dashbox" is awesome, my RPM's were initially reading high, I ping them on FB and instantly they responded, I had my config set for two cams, once I set it to one pickup it read correctly, they provide fast support. I'm sure I'll need them as I get other inputs configured.
I'm also using macrodroid app with two macros. When I start the car and the tablet notice charge in USB, the macro unlocks tablet and opens realdash, so I don't need to wake up table it does automatically. When I turn car off the second macro notices usb charge out and it kills realdash app and powers off tablet. The nice thing about android all can be configured. The Ipad does have nicer display but it can't be as customized, apple locks a lot of things.