So with the FOBOs your at the servo and need to add a little more air to the tyres. You pull out your TPMS sensor removal took (spanner) so you can pull the sensor off the valve and pump up your tyre and then re-install it again with your spanner. Far from factory. Might want to compare apple with apples.
And the two offers of $445 supplied sensors and $250 BYO, sheez, couldnt get any better in the fact you can buy the sensors for as cheap as you can get them.
Where? Got a link? to the "cheap" sensors and have you confirmed they will work with the JSB "factory" solution? -it's not actually a factory solution it's a hack into the ECM /computer which isn't sanctioned by Holden, if it was then it would be factory.. I am not prepared to risk it as it if it goes belly up then you would not be covered under warranty. (my car is out of warranty but I still wouldn't do it) If it was that easy and risk-free, you think Holden would offering this as an option already. Just think of the money they could make!
It's still more expensive but hey it's your money !!! Plus I don't have to have my ignition on to view the pressures. I can view my pressures from inside my house (see photo below) Plus I can monitor up 20 cars.( I don't have that many LOL)
Plus everytime you take your car to Holden for a service any new BCM or ECM or software update is going to erase this and bring it back to factory default, this was mentioned in the FaceBook posts. So then you have to reflash the module again...you need to request the USB dongle and do it all again and pay for postage and wait. So much for the "convenience" . Apples with Apples right there!!
I have timed how long it takes to remove the lock nut and the sensor, all of 10 seconds.. I bet after a bit of practice I can reduce that down ! But my tyres rarely need filling and I don't need to check them at a servo now as the sensors will alert me when the drop below 33 psi. Before I was checking every week but seeing very little change in the pressures.
I have already stated the locknut is optional, there is no need for you to use and then it is just a matter of unscrewing it as you would the valve cap.