The writer of the article (a SAR regular) is clearly very positively impressed by the M10X and it's designer, Michael Meier. This bodes well for the rifle, as SAR typically does not write puff-piece reviews. They are not beholden to the major manufacturers and never hesitate to point out design deficiencies or manufacturing problems. SAR found no fault with the M10X,, instead singing it's praises for design simplicity, accuracy and rapid-fire reliability. Even heat mitigation is addressed in a positive light, thanks to early venting of excess gas and ample ventilation through the handguard. In summing up the M10X, the reviewer notes that at 7.7 lbs (with the 16.5" barrel), the rifle is lighter than the SCAR (L), XCR-L, or Galil ACE. He goes on to observe that the M10X is less expensive than its direct competitors and asserts that Mr. Meier has achieved the "Holy Grail" of small arms design by combining AR accuracy with simplicity surpassing that of the AK, with modularity built-in from the outset. The reviewer bases these assertions on the fact that testing reveals 1 MOA accuracy with match ammo, and that the M10X contains far less parts than an AK (53 versus 70+).
A final note for those fixated on the "sand test" is that M+M will be offering the snap-in gaskets shown in one of the on-line videos by the time the Dec 17 issue of SAR hits the shelves. These gaskets will seal the cocking handle slots in the receiver against dust and debris, rendering the M10X impervious to the elements. It would seem that M+M are truly receptive to suggestions for product improvement.
Another positive review, this time by a reputable firearms periodical. So much for the haters and their baseless design complaints....
PS. The YouTube video that shows the cocking slot gasket upgrade is called "M+M Inc SHOT Show 2016 - New SBRS and More!". Discussion of the gaskets starts at 1:37