The home button on my iPhone 4 would intermittently misbehave. Sometimes when I clicked it, it wouldn't react. Other times, it would act as though I had double clicked it when I only single clicked it. Most of the time, it behaved OK.
Overall, the repair went well. The new button now behaves as normal, and I would consider this a successful repair.
When reassembling the iPhone, it was tricky getting the four little EMI fingers on the cellular antenna to stay in place beneath the lip of the LCD frame. They kept wanting to pop out, and I ended up breaking one of them off because it had popped out of place as I was tightening the 2.4 mm screw. My advice is to pay special attention to the position of all four EMI fingers as you hold the speaker enclosure down and tighten the screw to make sure none of them pop out of place. Otherwise you might be ordering yourself a new cellular antenna.