I fertilize about 50 residential lawns and most of the spreaders out there are junk.  These are more like the old scotts spreaders they stopped making about 8 years ago.  They spread fairly evenly, and the only downside is that some fertilizer gets into the gears and can cause problems.  The other spreaders all do it worse.  I drilled a 3/8 hole in the handle to help get it out and it is a lot better.