Overclockers Club published a review on the ASUS X99-A
A quote from the article:
Drive performance on this board is well covered with both SATA Express and M.2x4 support as well as your standard compliment of SATA 6Gbps ports. This gives you the ability to not only use standard SATA drives, but move up the level of drive performance you can take advantage of, should you choose to use them. Overall, there is not a whole lot I can say negative about this board. It's a solid addition to the product stack, and a great entry point if you are looking to move up to Intels Extreme series socket 2011-v3 platform. At $254, it not going to break the bank. For that price point, you get a good looking, quality board that delivers all that it you expect.ASUS X99-A Review @ OCC