L's Successors is more of what it was billed as: a rewrite of the second half of the series. The Mafia subplot from the second half of the series is cut out, thank god, and instead, we get new scenes that focus more on Near and Mello, along with more telling scenes about Light instead. A lot of the plot is still the same, though, which is confusing, as it's not explained where Light's father went off to, or where Mello got the scars on his face, so more attention to blending the new plot into the old would've been appreciated, instead of simply inserting new footage.
But, know that if you're going into this without having seen the series, you're probably going to be confused, mainly because of what I mentioned above, along with the seeming assumption that you've already seen the series as you're watching this.
Otherwise, sound and art is the same as it was in the show, so not going to reiterate it here.
Slightly better than the second half of the series, definitely worth a watch.
