I've got it in my A6 Allroad which I've had since new. 2013. I was a bit concerned about it when I first got the car, more over whether it would annoy the crap out of me than anything else.
Happy to report, I leave it on, and pretty much forget it's there.
There's a whole bunch of parameters that have to line up before the stop start will turn the engine off. Obviously stationary, foot on the brake, engine up to temp, air conditioner compressor not required (cabin temp down to what's selected), battery voltage above a certain minimum. Unless all these are lined up the engine keeps running and gives you a little symbol to say, "in case you were wondering, no I'm not shutting down".
It also requires a fair bit of pressure on the brake pedal. I find that, without really thinking about it, if I pull up at a stop sign, or a red light about to change, or a roundabout I pull the car up, just before it stops I release most of the brake pressure so that I'm just holding the car from rolling, but not with enough pressure to activate the start stop. You learn to use it, and it does work surprisingly well.
No battery issues, no starter motor issues. My A6 is also a 3.0L 6 cylinder diesel so a lot more cranking torque required than for a 4 cylinder petrol. If starter motors can handle hybrid drive trains that seem to be starting the car every 30 seconds, then the amount of starts your Tig will be doing will be of no consequence.
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