This app is AWESOME! Total control of my fans, left and right side individually, who could ask for more? Three category default settings for AC power, battery, or charging, with the ability to create my own personal default profiles in each category, just amazing! The function is flawless on my MBPr 15. Now I can set it on my bare legs, and the bottom of my laptop stays cool (max speed both sides) to tepid (Med speed both sides), depending on fan sped "I CHOOSE," not Apple. Menu bar info is easy-to-read and exactly accurate.
As one who uses constantly running air purifiers in my home/work office, I know that these type of fans run for years with no issues. They are designed to run 24-7-365 and never wear out for years. I know Apple uses the same quality type fans or even superior, so I never worry about replacing fans prematurely in my MacBook. Moreover, even if I needed to in two or three years, that's a fraction in cost of replacing my SSD or multi core processors due to heat, not to mention that cooler processors run infinitely better than overheated ones. All high graphic use 3D gamers know this, I'm told.