LJB
I have the (new) Waves L1 and to my ears the Concrete Limiter sounds better, esp in the low end. It's a 64-band compressor if I recall correctly. I use it all the time, though not as a final mastering tool - I have Ozone 8 for that..
I had the old version of Waves L1 as well as L3 which has EQ built into the GUI solving that problem
One of my absolute favorite go to Waves mastering plugins is the Waves F6 Adaptive EQ.
What's so great about the F6 is it only effects the areas at the points where the frequency anomalies occur and leaves the over all broadband EQ curve alone which gives you an over all more constant and predictable sound than a traditional fixed point EQ even could.
And yes it can be used on tracks, great for things like killing the boxiness out of close mic acoustic guitars, eliminating PLOSIVES and sibilance from singers who like to grab hold of and eat large condenser mic's, but running too many instances of the F6 will have a serious effect on computer recourses and recording latency, so don't forget to FREEZE all tracks which you use the F6 on.
It's very much like having Cakewalk Adaptive Limiter built into the MB64 Multiband Compressor in one plugin, plus with a whole lot more functionality and control for zeroing in on just one problem frequency, or separately set and adjust ALL problem frequency band ranges completely independent of each other, each band switchable and assignable to mono, duel mono, stereo, center, and sides.
It's like a parallel processing matrix with an overhear cam and glass packs, LoL
But the L1 and L3 to me are really good for focusing on Electronica and Club dance music where there is NEVER any shortage of chest thump'in bass and kick drums going on, they were Waves answer to psycho acoustic processors such as the Aphex Aural Exciter and the BBE SonicMaximizer.
Used judiciously and sparingly, these were really good at beefing up analog tape recordings, especially for restoring 10 to 20 year old tapes that lost all their high end frequencies over the years to prepare and repair them for mastering for digitizing to high quality .mp3 and CD formats. Waves L1 for harmonic tuning and L3 for tone shaping were my weapons of choice back in the day as great software equivalents to the Aphex Aural Exciter hardware which I still own and use occasionally for live sound reinforcement to give the illusion of having a bass sub when there actually isn't one.
They really work their magic with time delay in the upper mid to high frequency ranges actually fooling your ears and brain into thinking your speakers or the source of the sound is actually clearer and or more airy then it actually is.
I remember reading a "white paper" on psycho acoustic technology back in my studies for Audio MIDI engineering (Berklee School of Music Home Study courses circa 2002-'03). Typically overloaded with boring, tedious, and seemingly useless physics and stuff us creative musical types couldn't give a dead rat's sphincter bone about (until you finally get a grasp on it), I found Aphex's white paper on PAP unusually festinating and thought... OMG.... aM I tUrNing iNtO a NeRd?

And what was really amazing was, to field test my understanding of PAP, I plugged/wired my rack mount Aphex Aural Exciter type C2 into an old cheap Sony car stereo with a Radio Shack cassette player adaptor and hooked the Sony car stereo up to an old 6"x9" car speaker which I simply just placed on the carpeted floor and wasn't mounted in a speaker cabinet. Placing a bare speaker on a thick rug shouldn't produce any real low frequencies which actually radiate from the speaker cabinet itself.
I wouldn't say it sounded like a Marshall or Fender amp, but quite shockingly it
DID sound better than most cheapo bargain basement amps do, ya know, the kind of no name amps music stores like to sucker beginners into buying for $50 that come in any color you want, except for the color you want??
Second gen Aphex's type C (with BIG Bottom) and BBE added bass contour control, a.k.a. sub harmonic synthesizers to fool your ears and brain into thinking the bass is actually there.
Cakewalk has a plugin for adding sub bass harmonics synthisis that can be used to compensate for the L1's lack of bass control, but I can't remember what it's called at present. The plugin looks like a 19" rack mount unit, and like a lot of Waves plugins it has a switch to cut back on CPU usage so it can be used on tracks without taking much of a hit on computer resources.
And so, I'd also like to point out at this point is, assumptions are not only bad, they tend to be ridiculous and absurd coming from the completely negative mindset of those who assume everyone is out to get them, and assume anyone who says something they don't agree with or "believe" is lying to them.
All I can say about that is PPPPPBBBBBBTTTTHHHZZZzz.. Sounds pretty shallow and narrow minded to me..

What makes anyone think they are so important or special to make such grandiose assumptions like that?
And from my experiences, I found 90-95% of SONAR'S stability problems come from user error and poor work flow habits, and from novice user's who feel, just because SONAR can record unlimited tracks supporting 100's of plugins, doesn't mean
your computer can! And just because you have an early gen Intel i7 machine you purchased on sale at Best Buy, doesn't mean you have a computer workstation capable of running a modern day DAW full steam ahead.
And while it's very possible to run buss and mastering plugins on tracks, and vise versa, and get good results by breaking the rules and such, as long as you know how far you can push and go before crashing, burning, and crossing over the red line of destruction.

It's a really good idea to learn what these plugins do and what are really all about and what the recommended uses and applications are.
And it's a GREAT idea to learn what the rules are before breaking them.