I have installed the WW Happy Trigger in 2 Marlins and I love them both.
No down side and it is definately worth the money.
Of course, if you have a local gunsmith that you trust, a trigger
job could give you the same result for less money. But that's
only if you have access to the trusted local smith. For the rest of
us, the Happy Trigger is the way to go. Very easy to install and instant
gratification.
Bob A