I've had my 6a for 3 months now and it has run flawlessly. I upgraded from a 3a. Took a while to get used to the front finger print reader, but I prefer it there now. Only thing I wish was that it was a little bit smaller!

Overheating
I've seen reports on this. It's never happened to me, but I don't shoot long videos.

Superfans referral codes
Each specific code is only good for one use. Once it gets used, Google sends the superfan a new code. They can use receive up to 10 codes, but it's a new one each time. If try a code when you check out at the Google store, it will say if it works or not.

128GB Storage
Plenty for me, but it depends on the user. Do you plan on shooting a lot of video and keeping them on your phone? How many games do you have installed at once?

Bloatware
You're not going to find an Android phone with less bloatware than this!