Looking at getting one of these but not sure which to go for, there is the Unger and then vikan, both look pretty similar though I like the look of the Vikan being able to lock the handle, the unger one seems like it would flip over really easy? Anyone have experience with either product? and will either one fit on a harris pole? I have a big house that wants me to clean the insides but they have really high skylights over nice carpet. Also how well do they work? Thanks in advance.