I was thinking about picking up the Pro-Q 2 as a deluxe replacement for the Waves Q10 which doesn't play nice with Sonar. But then I see the Essentials bundle (Pro-Q, Pro-R and Pro-C) is on sale at 25% off, and I was wondering if it's a no-brainer? 
 
I mean I already have a ton of reverbs and compressors but I was thinking that Fabfilter plugins are so good (both sound and GUI) that they may well turn into my go-to defaults that I use on every track? Or am I not missing out on that much with the Pro-R and Pro-C?

If you work with Pro-Q 2 for a bit, it would probably be your go-to EQ in no time at all.
 
For clean compression that's dead easy to set up, Pro-C is hard to beat.  It's not a "character" compressor, so a collection of those is nice to have on hand as well.
 
Pro-R is for when you want to recreate the ambience of a concert hall in heaven.  It's not a realistic reverb in my opinion.  Reality does not sound this exquisite.  It's beyond dreamy ... oh, yeah, it's also a total trip to watch in action.

I've been demoing Pro-Q 2 for 15 minutes and it's already my favorite EQ ever. It's transparency I expected but what impresses me is just how easy it is to put any EQ whim into practice in seconds. Every eventuality is designed for. I don't know how I'd ever do without its band auditioning feature going forward. I have to have it. Still not sure about the bundle though. Pro-C looks like another must-have workhorse in terms of functionality, but I don't know if I really need Pro-R. Maybe I should demo it. 

Pro-R has been used on every project of mine since I purchased it on its release. But you know what sort of stuff I do James and that I am not looking for realistic reverbs, generally.

Pro-Q 2 is my go to EQ.

I've not used Pro-C much.

Upgraded to L2, picked up the Reverb for $89.
Like you I have too many Verbs; what can I say ?

All you gotta do is watch a couple of Dan Worral's Pro-Q tutorials and you're hooked. It goes on 50% of my tracks. (The other 50% get MDynamicEQ).
 
Pro-C takes a little longer to appreciate, but over time I've come to realize that it can fill pretty much every dynamics application from vocal/bass leveling to de-essing to master bus glue duties. CA-2A still beats it for ease-of-use on individual vocal tracks, but if you need finer control or parallel processing then Pro-C's the tool. It can even do 1176-type aggressive clamping, but don't expect the same extreme distortion.
 
I do not own Pro-R, but demoed it extensively - it's impressive. I just couldn't justify the cost. I'm just not a heavy enough reverb user to feel a need for multiple flavors for different moods. But for a reverb connoisseur or someone who doesn't already have some Valhalla 'verbs, it'd make a nice addition.

I can pull the Valhalla demos now.
Any two of Plate, Room or vintage would have run $100.
Hell i'm $11 ahead of the game!
Anybody want to have a 🍺?
I'm buying...
T

I don't drink, but would happily stop by for a bong hit.