I'm more impressed with the nearly two years of use of the 650mAh batteries and pass-thru.
I have a 650 I bought in May that is already showing signs of decline.
There's a lot of variation in the quality, and how it is treated can have a big affect too. A lot of people think that it's still necessary to completely flatten a rechargeable battery before charging, but with Lithium batteries nothing could be further from the the truth:
How to Prolong Lithium-based Batteries - Battery University
Have a look at table 2, number of life cycles as a function of depth of discharge. It's better to put a battery on charge when you get home instead of continue to vape on it, and it's better to not flatten a battery until the electronics turns it off.
My wife kills phone batteries in 6 months - she always run them flat. I had a phone battery I used for about a decade, simply because I gave it a short charge every night.