Comfortable and lightweight, and extremely 'dynamic' when it comes to runs
I ordered the cloud x in a size 8, and the fit was excellent (so it's probably best to order true-to-size). The shoe felt very lightweight and comfortable from the start. I took it out for a quick 5k, and finished the run feeling very impressed with the performance of the shoe.
As others have mentioned, this shoe really does seem to encourage a faster pace. On landing you feel the decent cushioning of the clouds, but with still enough firmness to maintain that 'ground feel'. Upon pushing your foot off the ground, the sole seems to firm up and give a real spring to your step, encouraging you to keep forward momentum and a fast pace.
Highly impressed with both the comfort and performance of this shoe. They look great as well. Overall, it is very easy to recommend this shoe, especially for my purposes (quick 5k runs, slower 10-12k runs, and sprint intervals).
(Also worth mentioning that the whole process of ordering and delivery was quick and efficient, ordered very late on a Tuesday evening from the UK and they arrived by Friday afternoon.)