The home button on my iPhone 4 only registered 1 out of 7 times.
Well, I broke my phone. After replacing the part, I was piecing it back together like a friggin surgeon and I accidentally ripped the digitizer ribbon cable from the back of the LCD panel.
Oh I did have one small complaint about the replacement home button... the length after the bend in the ribbon cable, I call it the elbow, was a bit longer than the original so it didn't want to fit in exactly like the first. It was annoying to look at, until I closed it up, and after I broke it it's really not that annoying at all anymore.
Don't break your $@$*.