I own a Mid-2012 non-retina 15' Macbook Pro.
It's hard to verbally describe, but the trackpad feels like it "sunk" more, and multitouch isn't as responsive as before. In fact, I've fallen into a habit of clicking harder because it doesn't seem as responsive.
I've never once removed the battery. The only times I take out the bottom cover is to occasionally clean out the fans. I think the trackpad sinking feeling happened shortly after the last time I cleaned out the fans, which was several months ago.
It's hard to verbally describe, but the trackpad feels like it "sunk" more, and multitouch isn't as responsive as before. In fact, I've fallen into a habit of clicking harder because it doesn't seem as responsive.
I've never once removed the battery. The only times I take out the bottom cover is to occasionally clean out the fans. I think the trackpad sinking feeling happened shortly after the last time I cleaned out the fans, which was several months ago.