I take it you've never had the pleasure (cough) to use a Mediatek equipped phone. 
They are notoriously poor performers, notoriously buggy and poor on battery life, and rarely receive the Android updates that were promised. GPS is poor at best.
I can tell you all of this is true about Mediatek chips - I've got a Mediatek MT6592 equipped phone that I got stuck with via work sitting a foot away from me, and it's a complete dog performance wise. Had it for about a year now (Alcatel Idol X+, comparable or better specs than the C= phone), and I wouldn't wish it on anyone.
It was free with an under $20 a month contract.
I don't begrudge anyone spending their hard earned money on a phone with a $100+ logo screened on it - whatever floats your boat. Though it does annoy me when people pay $300+ for a sub par phone that will end up getting no support, lol.
You can get a OnePlus for the price of the C= phone, c'mon.
I have not used a phone or anything with that processor in it. Was this Octa-core processor the same one that gave you issues?
Not all electronics are perfect out of the gate..Even the best of companies have initial problems with their products, just sayin.
And reliability of use is off topic from org post. Like I stated based on the listed specs vs price and being unlocked $300 is not bad, and you all know it.#truth. Whether the phone actually works, well
that remains to be seen and is unknown at this point.
The phone you had was free? ..there is this saying.."you get what you pay for". Perhaps this new PET will work as described if it in fact ships. I'll let ya know
.
Rich
