"I bought a 28mm unbranded pipe cutter from an online vendor. It made one cut with difficulty then broke on the second cut, forcing me to have to pop to Screwfix mid-job for a new one.
I am surprised by how lightweight the Rothenberger cutter is. The blade felt sharper and it cut a painted pipe with no difficulty. Not only that but I noticed there was no pinching on the pipe, whereas using the unbranded one had pinched, tracked even and struggled with the paint.
You might be able to find this item cheaper elsewhere, but Screwfix stock this item in store and they have always given me an excellent service."