Viral-loops : awesome growth hacking strategy or so-so, works ok?

Lifetime BF deal on over at appsumo, looking for some feedback from indiehackers who have used it before :

what was ur experience like? Horror stories? Success stories? Mediocre success stories?
do you recommend it?

FYI I plan on building and launching a number of things in the foreseeable future, so that’s why the lifetime deal peaks my interest.