"Assuming you have standard size pipes these are excellent - they fit in seconds, even in difficult to reach places. Plus no more metal bands and labels with sharp edges to cut you or the customer!
I've marked down value just because they are over the double the cost of a standard clamp and features because of the limited pipe size range (but that is understandable from the design). Otherwise I thoroughly recommend them.
Oh, and i think screwfix have sorted the item listings as I got the size quoted."