There was a time when nearly all I used were the Ren series. The RenComp, RenEQ, and RenVerb were my go-to plugs.
Now, there's already so much inside SONAR that can do my bread and butter stuff. I like the idea of a steamlined toolbag that has a little more futureproofing in it, and since most of it is folded into the Pro-Channel my preset library is making my feng shui shift way more towards "less is more".
The plugs are awesome, don't get me wrong, but there is something that comes default with X3 that matches all of those.