You do not need a 3D TV for this devise to work. It is fully backward compatible and works with any TV you will just not have the advantages of 3D but you will have the advantages of the sound that is better than TV speakers!

LOL, are you kidding! Sorry, that wasn't really helpful but I couldn't help it. There are some programs that come installed that you can get rid of with just an uninstall command in the application manager. On the other hand there are some programs that are permanently install whether you want them or not. It's been like that for decades on all phones and tablets from wherever you get them on both operating systems (iOS/Android). The only way to get them out is to perform a rooting of the device which can be hit or miss depending upon skill of the hacker. I did kill one phone doing the procedure once, it made a nice paperweight for my desk afterwards.

I have one of each actually and there are several differences. The Pro8.4 has a better resolution and a more wide screen format. The "A" has a squarer screen. The underlying aspects of the electronics are pretty much the same and they both seem to work really well. I think they have different processors but same RAM and Storage capacity. Get a salesperson to help you with comparisons at the store. They had the detail for both on hand I believe or can at least pull out the boxes and show you what's in the device. If you're watching movies a lot then the 8.4 is really better looking in my opinion. Both will play them.

Pretty sure the only difference is the color of the device. The Geek Squad is Best Buys technician department. They are supposed to be knowledgeable about the products they sell and can help you with setting up or fixing any issues that arise from normal use or give you option on what to do next if they can't fix it. You'll have to check with them to explain your particular protection plan above and beyond the Geek Squad. There are just too many out there to answer here.