Opinions on Avacallo boots

Hi there. I am wondering if anyone has tried the Aacallo gel tendon and hind boots. I have been looking at them and like what I see but don’t know anybody who owns a pair and can’t find many reviews online. I would really love to hear what people think before I buy them.
Here are the links: http://www.horsehealth.co.uk/equipment/boots-bandages/acavallo-tendon-boots/ultimate-tendon-boots-black