Board Thread:General Discussion/@comment-26316965-20150723043941/@comment-24756040-20150726053033

They're not as effective on flash because you don't have the Heli Pilot available to get infinite range. However, just placing a tower at the entrance(s) grants near-unlimited range, and camo detection if the tower in question has it. Advanced Intel also helps a lot in setting up towers en masse, because just placing towers all over the map gives all Monkey Subs infinite range.

Shame that Airburst Darts w/ level 3 Monkey Sub Bay makes Barbed Darts a useless upgrade, unless you need to get Advanced Intel, which you should almost always get.