No... Wouldn't you think if Insignia had anything to do with Sharp, that Sharp would manufacture lower end models and put Insignia on those TVs instead of the other way around?

I have researched it for myself. Sharp has nothing to do with Insignia, that guy doesn't know what he's talking about.

The screen is always 120Hz, but the "Info" display shows the refresh rate of the input source. Most devices output 60Hz. Blu Ray players can often do 24Hz (or 24p), computers can do 120Hz.

No. But as someone who installs TV equipment for a living, many of the built in wifi TVs have slow response times and poor navigation. Most people are better served getting an appletv, roku, chromecast for streaming. These solutions will tie up an HD slot, but are also more robust and less costly.

I found with this tv ..only blu-ray would maybe be 120Hz..I had so many issues with this TV motion blur and grainey picture quality and had a black line develop on the screen..took it back yesterday and got the samsung 50"LED 120hz for $699..you should do the same..100x times better

I don't know what the warranty is but all Flat-Panel HDTVs come with the stands you see under them in the product images... and yes, the stand is removable. You should understand that a wall mount is an extra, purely optional, accessory; a TV needs to be sold with a stand so it can properly sit upright. Many people can't afford (or just don't want) to toss the extra (ridiculously priced) $100 or so for a wall mount on top of the hefty price of a 50" so all TVs come with their pictured stands. You just paid all that $$$, the friggin' TV manufacturer better throw in a stand so you watch it w/o having to prop it up against something haphazardly!

No you can't do this. Just like with most electronics, when you plug in a headphone it automatically becomes the priority speaker device. Why would you need a headphone plugged in and the speakers? That makes no sense.

Yes. If you have the Wii component cables all five colors will match to the back of the TV. If you have the standard AV cables, the yellow will go into the green plug and the red and white audio will match their respectively colored plug on the TV