I am planning for it early next year with Bikat Adventures. Haven't heard good reviews about Adventure Nations.
Happy to connect more on this. Feel free to message me. :)
Hello Vandy! before looking for a good travel group organizing this high altitude trek, I will suggest you to prepare yourself for Chadar trek (both physically and mentally). Follow all the instructions required for high altitude trek. Select a good travel community having prior experience in Chadar trek.