it's heng suay one. my iPhone 3G, which was supposed to have an easy to spoil home button lasted me 2-3 years with no loss in sensitivity. Helps that I've never dropped it. 3GS, 4, 4S, 5, 5S, all use home button with no issues.
But if i have any gripe, is that physically pressing a button is a bit annoying, especially one you have to press so many times throughout the day. would have love an accessibility feature where i can simply tap once on the touch ID to go home, and twice to get to recent apps without the need to depress the button. :/