I coach track and field for a level B University. Being in Michigan, we may have trail meets in Midland Michigan to track and field events. About every 3 to 4 years, we re-evaluate our gear and in doing so several of the varsity team members try the different models pertaining to his or her event. So this month we purchased the Cloud - cloud (Flagship model), Cloudcruiser, Cloudflyer, Cloudsurfer and Cloudventure. Well in our two week test run and actually having at least two runners try out each shoe the results were impressive. We have an internal 10 point scale 10 being best 1 being worst based on different attributes such as comfort (which drills down into 3 separate values, performance, stability, etc... Well all I can say is that the cloud was a 10, the cloudventure was a 10, Cloudcruiser was a 9, Cloudflyer a 9.5 and the Cloudsurfer was a 9. These numbers would get the gold at any Olympic event! The only sad part is that On doesn't have any offering for spike sprinters events. Whatever we choose for the next 3 to 4 years (unfortunately other issues come into play such other brands reducing their shoes by as much as 50 percent and yet others giving free shoes - which we don't necessarily accept if the team has problems but sometimes politics get in the way), doesn't discount the superb engineering behind each shoe we tested. I will do my best to get On on the winners stage as I tried several of the On shoes and for the first time in my career had running experiences that were much, much more than just marginally better, but revolutionary.