Awesome concept, and a fun event, but it's really showing its age:
No options to edit NPC damage scale or aimcone scale, no loot % chance to drop (leaving loot tables "all or nothing"), and no more than 6 NPCs work for deploying from the heli despite more being configured. Thus, they end up being a little too easy to kill unless you just simply increase their health (which is configurable), and killing the Refuel Heli while flying ends up giving less of a reward that the regular Patrol Heli.
There's not a built-in way to have it replace the regular Patrol Heli, but this can be accomplished by other plugins. It would be nice to have this option, but not too big a deal, aside from when 2 helis (regular Patrol Heli and Refuel Heli) are on the map and players can't be sure which is which until it's close enough to notice that the Refuel Heli has NPCs aboard.
The plugin also has quite a large hook time and seems to be unoptimized. I assume it would need quite a bit of refactoring, and it seems to get updates mainly only to keep it functioning
The option to add custom LZs is quite nice, however, as is the option to show a map marker while it's at a refuel LZ. The customizable chat messages also add a fun element.
The way the heli is destroyed by the plugin when despawning off the map is picked up by DeathNotes as it being shot down, and the maintainer doesn't respond to requests about this issue. The lack of support response leaves me somewhat regretful about purchasing it.
In summary, there are newer event plugins out there that provide a lot more features and value at this price point, in my opinion, though it is still a unique and interesting event.