I'll have to disagree that it was 1% of devices effected only. Way higher percentage than that depending on the particular generation of device and issue.
And some of them where not quickly resolved, some were denied and ignored and others were quietly resolved with the next iPhone release.
Believe whatever you want.
You can only get your money back within 14 days. And in sone cases the hardware issues didn't appear till passed the first 2 weeks and in some cases after the 1 year standard warranty expired.