I don't care.
My previous phone, a Huawei Mate2, was "stuck on" jellybean 4.3 for over a year before they pushed out (skipping KK)
Oh there were betas, cooked roms and what not, but I stuck with 4.3, because my phone worked perfectly. No problems.
In fact, I probably would have left it on 4.3, had Huawei not had an easy way to push it back to 4.3, from 5.1.
5.1 was very stable.
My new phone (about 3 months ago) a Huawei Mate8, came with 6.0MM. Huawei says 7.0N will come to it around the 1st
Qtr of 2017, but, even if they don't, won't matter. It's very stable, and I never have any issues.
I use 1500-2000 minutes on the phone per month, tons of web, mp3's, photos, what not and not one issue. All apps run,
no FC's. As long as a device is suppose to run as intended, I don't give a flip about what OS is on it.