Neat set of mod FX

There's three of them, a chorus, flanger and phaser.

Choral is a pretty flexible chorus unit, you have 4 different modes which affect the characteristics of the chorus itself, along with a standard range of options, like feedback, delay, chorus rate, and so on. I really just use the standard Synth mode, whenever I use this plugin. I have other chorus units that I personally think sound better, so this doesn't get used as much (but usually works out well when I do use it)

Flair is a VERY nice flanger. You can have it be a standard flanger, or you can morph it into a resonator mode where certain frequencies will ring out more, creating some REALLY cool spacial wash-over effects. Probably my favourite modulation plugin and only because of that, it's really nuts. Putting your flanger into the scan mode allows you to just set a key center and a chord or cluster of notes to play through. I will say, I'd love to be able to automate this stuff better because I'd love to change the notes themselves (but that probably won't happen for me until FL supports routing inputs to instrument VSTs/plugins themselves).

Phasis is a phaser. I honestly should use phasers in general a lot more than I am currently, because not only do I use a phaser really rarely, but whenever I do I just load up a preset on Phasis. It DOES have some neat features, though, like an ULTRA mode (yes, spelt in all caps) that multiplies the LFO and frequency range by multiple orders of magnitude. You can also change how many notches there are and honestly, this might all be something really useful to someone who uses phaser units a lot, but to me it's just not that fascinating, sorry.

All of them definitely have a merit, and more importantly, are far superior than the default equivalents FL studio provides. If you're using a different DAW which has a good set of mod FX included, then this might just be a different flavour/take.