We actually used these for a project that we did at my university. We have been doing a lot of research with high altitude balloons and we used these to create a mesh network between the balloons so that we could sync the data and get a more 3-dimensional view of the various measurements that we were taking. It worked perfectly on the ground, but a few of the devices had communication problems at high altitude. This was almost certainly a fault of higher levels of radiation and increased distance between the equipment than any flaw in the devices themselves. Overall, they are a very handy product.
