It is interesting in the speaker section of the review of this GT70, "Only a few notebooks achieve comparable sound (e.g. the Toshiba Qosmio X770). "
However, in the Qosimo X770 review, it does not mention the GT70 so it doesn't go both ways. "Very few notebooks, such as the Dell XPS 15, can hold their own against the sound output of the Qosmio X770."
The MSI GT70 should have come with a 230W AC adapter! The 4700MQ or better processor (and upgradable to the 4940MX) with the high end GPU such as 680m, 780m, it's not enough and the laptop grabs power from the battery in order to run the GPU and CPU if both are at full load.
Now, in 2015, Alienware is doing the same thing with their 2015 R2 laptops with the 980m and Haswell CPUs. Luckily it can support a 230W and customers can get it for free if they complain, but it should be standard!