I use something similar from B&M, like stock photo
It lives in the load-space, in my 'emergency equipment' box
I change it, either when the car fogs up again, or the crystals lump together
The air in the car is changing all the time, for those to work you need the thing they are trying to dry sealed up. If you mean smell from aircon leak you would not notice it at all.
Best I can manage is to keep the screen clean (in principal) and park facing the morning sun with both windows cracked, then bang on the heater when I use the car.
I've had heated screens in Fords, Range Rovers and my wife's Skoda (although unfortunately not mine). They are even available (aftermarket, obviously) for Series Land Rovers. I think a HFW is a huge safety and convenience item and it is high up my list of nice-to-have when buying a car.
I have got into a Range Rover with thin ice on the outside of the screen and condensation within, switched on the HFW and been ready to go in 30 seconds. Even the Ford wasn't that quick.
I'd rather have HFW and A/C than any amount of 'premium' audio and built-in satnav.
Years ago a neighbour bought an elderly Toyota Starlet and found an empty Isopon tin in the spare wheel well. It was too hard to work out where it had been used...
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