Let's clear the air once and for all about Windows 10's free upgrade, and why it's worth to take the leap and leave every other Windows version behind.

The invention relies, at least in part, on technology already present in the Taptic engine that powers the Force Touch trackpad on the new 2015 MacBook Retina, which simulates pressure clicks through the use of vibrations. The Taptic engine was introduced also as one major feature in the Apple Watch and in the iPhone 6.

A brand new windows 10 preview build, number 10061, was released yesterday, featuring a number of substantial improvements, and the return of Mail and Calendar, with updated look and feel, plus an array of other refinements.

What better way to put the Intel Core M to the test, than to bring in the top four consumer laptops, for the ultimate cage match?