There is quite a few topics on Scubaboard - Aggressor fleet is a bit controversial. Seems the individual boats operate on franchise basis under as single brand, and when anything smelly hits the fan, parent company washes their hands off anything.
There are certainly lots of positive stories out there, but also quite a few total wrecks (latest one in Komodo, where boat stayed in port whole week, and refused any refunds). Seems as long as it goes well, all guests are happy, but if anything goes bad, then you are on your own.
Might be worth combing the accidents section, that fleet seems a bit fire prone.
Also this might be of interest, also few recent guest reports towards the end:
https://scubaboard.com/community/threads/belize-aggressor-iv-mooring-breaks.639886/