Well we all have a different experience and opinions, I have changed the shocks and springs on my Kawasaki W650 to Hagons and it has transformed the ride.
Me too, I have changed the shocks on my W650 to hagons, the simpliest with no tuning, and no difference with the used original

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When i have changed for schock factory models, I discovered a new bike! Better handling, better grip, better comfort.
Wilbers springs in the fork.
I put shock factory too on my previous 500S, but I couldn't find the gain I had on the W... a little better but not like i hope.
the improvement seems to vary according to the models.
There are different qualities in hagon, I think it's better to avoid buying the lowest one.