Works great, even from 10-15 away. My main purpose for purchasing this was to be able to use more than one controller with my steam link. I have a lot of the older xbox one controllers (the ones WITHOUT bluetooth). fyi.. if you;re curious to know if you controllers is BT or not, just search it up and microsoft will show you an image where the new and old controllers have a slight difference in design.
See as i dont have any of the bt, i chose to use this to connect my controllers to my PC which then streamed over to the steam link.. and yes, it worked. I spent forever searching and no one could answer this. Just know that this has to be connected to the PC and your controllers sync.