I've used their Pine Needle Rake for collection of Pine needles and cleaning up downed, limbed tree debris ...mostly Pines. It works well for that. But never have I tried using it for dethatching a lawn. Seems to me that it would not work all that well.
I went through the Pine Straw Rake, Plug Aerator, dedicated Dethatcher evolution in 2014. I purchased a CMP Dethatcher. Strong, short tines on the CMP Dethatcher pull out the dead grass effectively. However, it is a one-trick-pony. Good for me.
Now that you mention it, I may try using my PNR to dethatch parts of my lawn. It may not be the best tool, but might be good enough. Sounds like it's worth a try for Fall rejuvenation/reseeding. And I already have a Cyclone Rage to pick up the thatch.
After 7 years of use I have worn out my first pine needle rake (Lienbach) and need to replace it. I will be buying the EA rake with replaceable tines next week.
These pine needle rakes are very useful for their intended use as well as smoothing and covering seeds. One of the more useful implements I have and has stood up well with lots of use over the years. I feel it is a good cheap finishing tool with a lot of uses.