A:AnswerI wondered the same thing but didn't overthink it and went for the 49". The TV is great, the sound is terrible. Don't know if you would have better sound with the 43" but I was planning on buying a SoundBar anyway so doesn't really bother me.
A:AnswerI don't know the exact dimensions, but I have a Jeep Cherokee and with the back seat down it fit perfectly with plenty of room. If you have a small sedan it might be a little tight in the back seats. Hope this helps
A:AnswerI got a notification of a software update over the weekend. Not sure if any tv is fully up-gradable for future proofing. It is a smart TV and software updates will be regular
A:AnswerPlasma have a history of being a hot TV. I've had the vizio for awhile now and I have yet to see it get hot. If you have the tv too close to a wall, then it will get hotter.