i must say that this was also my #1 deciding factor for whether or not to get an iphone. I compared the sturdiness of the home button of over 100 phones (including older phones like those big nokias) over a span of 10 years. Of course it was hard because everytime i thought i'd finished testing a new phone came out again (you know how technology is ha ha.) after all the testing was complete i interpolated the results of the sturdiness tests and compared it with the average finger velocity and force that it is susceptible to during normal use. Once i'd derived the data and reverse engineered the ideal collateral pressure capacity, i knew once and for all who the home button sturdiness king is: The iphone.
And that is why i got the ip5.