Is this specific to certain years only? I have a 2012 non-retina and it is great, but apparently certain years had more problems than others. Would you recommend it for my 2012 model too?
Be aware it isn't always thermal paste that is the culprit. I had a 2012 Retina 15" MBP that was normally 2.6GHz but would drop down to 1.4GHz. That was purely due to the fans and (tiny) vents getting choked up. Solved by opening and using compressed air to clean, no fiddling with CPU paste.
Everything I've seen says thermal paste is only effective at most a couple of years. It is harder to replace on your 2012 model but not difficult:
https://www.ifixit.com/Guide/MacBook+Pro+13-Inch+Unibody+Mid...