I brought a pair of hi-tec one's when I first started out but they soon lacked water in so wasn't so waterproof after all, these sound like a good summer boot rather than a 4 session boot at £15 pounds sounds the dog b*ll*cks to me. You'll need to try them on first. To make sure they fit right and are comfortable, bargain at that price, check to see if you got a store near you and go down and have a route round.
Also am unsure on how they work there online as if you went to the shop, you need a store card to get the discount of these products or just pay full price. The store card cost's £4 pounds for the year. Now am sure it's the same on line but never signed up for it. if you're unsure of this you could phone up and ask about the store card if there the boots you really what. I would presonnel only use them in summer. Hope this helps.