I did find the correct answer to my issue, the scrollLeft was causing issues in iOS.
$('html, body').animate({
scrollTop: $("#reviews").offset().top
}, 400);
This can be tested in http://jsbin.com/losuz/6/.
For comparison you can see the functionality suggested in Oscar Paz's answer here: http://jsbin.com/losuz/5/
I prefer the animation for the smoothness of the slide, but Oscar's answer is also valid.