There is no right answer for that one unfortunately.
Some people will claim the taste is dramatically better, others will claim it's about the same, and some will say they'd rather use something else. For me, the only thing lacking with say ... a Vivi Nova tank ... is just a slight dulling of flavor, mainly the sweet side of the flavor. Considering I don't like too much sweetness as an all day vape, I actually kind of prefer the dullness. But again, the dullness "to me" isn't a mind blowing difference.
Considering you're using a J tank ... I honestly doubt the difference will be mind blowing. But again, I could be wrong because we are all different. If you don't FEEL you need it, I'd probably just save my money for a rainy day or something else.
It's a tough one for sure because taste is so subjective.
EDIT: I will say though, I've yet to try mesh wick ... which is what many people claim makes it a much stronger vape. So the more I ponder this, the more I think I have no clue what I'm talking about. lol