I bought a small bundle a while ago (the EQ, compressor and reverb) and I have to say they're among my favorite ever plugins. I point blank refuse to use any other EQ now unless I'm specifically after the tone of a quirky analog one. I find it so much easier to shape the sound with them. They have so many cool features that I can't do without now, like soloing bands to hear exactly what you're targeting. I also love the super steep slopes you can get with the bell curves on the EQ, almost square. They're great for targeting very specific regions, like cutting out harshness.
The compressor is great as well, kind of like a compression swiss army knife. Again, it's great to be able to solo only the stuff that's going over the threshold so you can hear exactly what you're compressing.
Love the reverb too. Definitely not an all-round "go-to" since it sounds quite different to most reverbs, but amazing sounding nonetheless.
I wish all plugins were designed as well as Fabfilter.