I own a 4x8' drag like this. Basically it's two 4' sections - one behind the other. I bought a 4'er for each of my son in laws for road maintenance etc. I think these are great food plot tools. While I own an 8 foot long.....I don't think it's really worth the extra money for most of us. If I were buying today, I would just get a 4'er and save the money for other toys......errrr implements. ;)
As said there are three ways to pull these drags......I typically use the most aggressive way with my road and seed bed work. But, occasionally I will flip it over to do more of a "smoothing" action.
Great tools! Will outlast most of us. We pull ours behind our 4 wheeler.