I don't particularly mind. Attack on Titan abridged was hilarious, and I really enjoy their specials (mostly Bardock: Father of Goku, Episode of Bardock, and Lord Slug). I think the specials are fine, especially since they're following the timeline- I wouldn't say they're getting in the way of the main production.
On that note, if this is really in line with the chronology, Broly's next. I'm interested to see what they'll do with that one.
If they don't take advantage of the fact that Broly's got the dumbest motivation of any villain ever, I will rip my own hair out. They're usually good at pointing out stuff like that, though.
The Trunks Special was pretty good, honestly. I liked that they kept a few, but not too many, serious moments in it.
Spoiler:
Use the makankosappo.
Uuuuuuuuuse iiiiiiit!
Uuuuuuuuuse iiiiiiit!