Hi CentralPA,
I don’t have any experience with their comforter but I do think highly of their products in general. Wikipedia has a good article here on Alpaca wool and TMASC who is one of the members here and are very knowledgeable about bedding also have some information about Alpaca on their site here as well. It’s generally finer and lighter and warmer than many types of sheep’s wool and similar to Merino wool (which is a breed that produces a softer finer wool).
One of the forum members here just purchased an Alpaca wool comforter but they probably haven’t received it yet.
There is some discussion about comforters in this thread and post #3 here also includes several manufacturers that make wool comforters as well that are very knowledgeable about their products (which includes Cozy Pure).
Mills1428 purchase their comforter here so you may wish to post on their thread (and hopefully they will see it) and ask for their feedback about it.
Phoenix