Yes, I've been to all of them. Kaimuki Dry Goods is very good, but sometimes a little more expensive, but I go there often. All the classes I have taken have been through The Calico Cat. It's a small store, but the people are great, and is my favorite.
The Quilt Hut is on the opposite side of the island (I live in Hawaii Kai.) and I won't go there unless making a trip to the flea market at the stadium. They do not send out newsletters or answer any email. Most of their classes are during the week which makes it difficult for us working folks to attend and they are not helpful.
The last time I was in Kuni's (several months ago), they had very little inventory. They also hold classes but are when I cannot attend.
Much of the fabric I used for my son's quilt was from the Fabric Mart (3 locations on this island) has not held up well. Sometimes, I get frustrated, so I plan a trip! Thanks for the input!