I use them and find them really good. Raising the height can be a bit tricky I use a screwdriver to dislodge the clips as they are quite hard, and they are only really suitable if your using at room temperature as they aren't powerful enough for use in a shed or garage. Apart from that no complaints
Thanks for the reply, I would only be useing it in the house, but do keep my house cool. Never above 65, most of the time less. Would it work ok at that type of temps?