I've got one and am in dispute with the suppliers. I'm still in negotiations at the moment, so don't want to put all of the details in a public forum. PM me if you want my comments.
Are these the ones that you wet with water, but they don't get the coat wet? If so, yes I have them & have been very happy with them so far (I've had them a year). I use them on days like today if I have to do the school run with the dogs, the Spanish get quite warm in this heat & it seems to cool them immediately.
A friend with rotties uses the reflective type of cool coats and they work very well. I can't see her OH splasing out £53 on them. I'll ask which ones she has.
I have them for my cavaliers and I am very happy with them but they are a little expensive they sell scarfs for people for £15 could you get them one of them each and use it round the necks to try and help cooling your dogs .