I will second that the JD rake is a light duty rake. If your careful they are just OK. It is just a rebadged Tonutti rake. In medium to light grass hay you would be fine.
The Sitrex rake is a much heavier built rake. New Holland, M&W, and CIH rakes are all Sitrex rakes just painted and decaled differently.
Kuhn is making some pretty good rakes now too. H&S is a middle of the road rake to me. Lots of them around here but they are not as heavily built as the Sitrex rake.