Significant quality control and customer service issues

It's not my intent to be vindictive or petty, but I feel it's appropriate to relate my experience to anyone who might consider this device. I also acknowledge that my experience is anecdotal and not representative of every purchase.

I had to return the first one because it shut off and died spontaneously after a few days.
I had the second one for several months and then the screen went defective - the right side began freezing, it increased over the course of a day or so, and finally it became unusable. Many times it wouldn't even turn on. I've determined that it's not software. Something apparently came loose inside. When I applied light pressure around the screen it would work again for a few minutes and then the problem would gradually return.
I returned the second one and received a third. The screen shut off after one hour. Now I have two defective devices and Google will not ship me another until they receive one of the previous units. (That sounds reasonable enough except when a defective unit is replaced with a defective unit.)
Both the second and third units had the dingy yellow effect along one edge of the screen. I've read that it's the glue they use.

I like the tablet, but I regret not purchasing something available from a local store like Best Buy where I could replace a defective unit the same day. The value of the specifications are offset by not having a working unit. I'm doing Google's quality control for them at my own expense. I've unboxed and used plenty of tablets and I've never seen anything that dies over and over like this. Given that the average life of these units has been measured in days I have little confidence that the final working replacement will live far beyond its warranty.

Current Cricket customer, want to switch to MetroPCS unlimited data plan tethering?

I'm currently with Cricket Wireless. MetroPCS is advertising great speeds and with their unlimited plan, I was thinking about tethering my phone to my PC and using it's data plan and speeds for my PC. This way, it's cheaper than getting new Internet Service and I get to use my phone as well. Is it truly unlimited data and is there any limitations when it comes to tethering to PC? Do I need an add-on pack for that? Is it easy to do with any phone or would a certain phone be easier? I haven't purchased a phone yet so I will need to know which is best and if it will work! Thanks guys.

Is the bootloop issue active to sway a new customer elsewhere

The G4's price at some spots like Amazon is amazing to pass up. I have done my research on various phones and stay active on everything. With to many phones and variants in existence I can't be an expert on all. I'm still seeing the bootloop issue in forums but LG addressed this like 6 months ago. Are new in box versions of the G4 fixed? Or will these be phones that set in a warehouse for a year and will have the problem. I'm a android enthusiast tweaker. So my next phone has to be a contender with development. The 2 most important things. I recently bought a OnePlus 2 but after a ridiculous amount of negativity regarding hardware/software issues and overall negative real world reviews I sent it back before the 30 days were up. Most of which was recent times sadly. While some people might have a great version OP2 with good luck way to many people were sitting with a 0 brick in another country waiting forever. Sorry to ramble but I've been searching for 2 months now for a great midrange device that can be bought at 0 or less and have development but not have a guaranteed broken feature.