I guess what most people are complaining about this device is that it doesn't seem to have any advantages, just disadvantages. It can ONLY take a single rope, whereas with the normal ATC you have the OPTION of two or one. Even more so, the one advantage you would think would come with a device that is trying to be simplistic, being lighter, isn't the case.
I'm honestly curious, coming from someone who has used it, in what situations would this device have advantages over another standard belay/rappel device with two slots? What situations do you choose to use this instead of another?
It just seems to me that why not just use the double slotted device because it gives you more options if needed.