I have 1 of the more expensive ones. The deal is, they have rare earth metal magnets that are not cheap in them, but are far more effective than the mag float type of glass cleaner. I have owned many mag floats of the years, and the quality is just not even comparable to the Algae Free mag cleaners. These things clean with no trouble through much thicker glass, and clean in 1 pass since the bond is so tight. Now, the algae free ones like I have go for $100+ depending on size, but I have not heard of a cleaner North of $300, so this is either way over priced, or a different brand that I haven't seen or heard of.