I was having trackpad issue on my 2010 machine, did the replacement from ifixit which arrived broken (bummer) but they replaced it no problems. It worked great for just under a year but now I'm having the same issues again of poor finger tacking, jumping, and lack of sensitivity. I've tried cleaning the whole unit, rebooting in safe mode, refreshing code, and anything else the web has provided. I'm starting to wonder if it's something else on my machine or if the trackpads just don't hold up well enough. Overall I'm super frustrated to have a newer pad crap out this early.