OnePlus 3 - Should I buy?

[N00B2k16]

(Sry for my bad english)
I have a Lumia 925. It is an old phone model, and I will buy a new phone in the next year. I was planning to buy a Samsung Galaxy S7 ( it's price will drop after S8 is released ). But I just found out that OnePlus 3 has high-end specs and not too many bad compromises, and it costs only 400? (430$)! I know that OnePlus is a Chinese company, but all of the 1+3's reviews are really good. Does anyone here own an OnePlus phone? I have some questions: 1? Does the 1+3's (or 1+2/1/X's)software have any big problems/bugs? 2? How does the phone compare to Samsung GS7 and iPhone 6?
3? Does OnePlus update its phones, or does it just forget the older phones (OnePlus 2/1/X) 4? Pros & Cons?

 

[tgp]

It looks like you're going for Android. It would be good if you would ask this question at Android Central. That said, WC members use other platforms too, and there might be some OnePlus 3 users here too. I personally haven't used that phone, but from what I read about it, it is very good.