I don't really notice any gain in over all power. But increase run time, and cooler temps are for sure. As for the increase of motor life, I still have to see, I've only gone threw 4 gallons of Gen2 so far in the last 1-2 Months.
The bottles are sealed too, so buying a case at a time is no problem, and storing them. The day you break open the bottles seal, is the day the aging starts. But if your like me, aging is never a problem....
The only thing I found, was with the new color "Tangerine" leaves a tent of that color inside the motor now. Cleans off easily with denature alcohol. But Gen1 never left any color.....