Waves NX - Virtual Mix Room

I mix at home with headphones.  Unfortunately it's my only option outside from sending the tracks to a studio to actually mix in a GOOD room...
 
I'm thinking about buying Waves NX - Virtual Mix Room, but the only reviews I can find online are basically sales-pitches.
 
Does anyone have any opinions on it?  Waves is selling it for $49, and I'd be happy to pay that if I thought it would help my mix.
 
http://www.waves.com/plugins/nx#introducing-nx-virtual-mix-room
 

+1 to what Larry said.
 
As for reviews, there are many on YouTube (not made by Waves). Here's one, for example:
 
https://www.youtube.com/watch?v=SBFZ3GquYR8
 

Ferris has left the building.

Zo
Sonarworks refererence 3 is what you want ....

Great, thanks everyone!

I think it's pretty good although I'm not sure if I like it more than the VRM Box, which for me fell out of use when I switched to an RME Babyface with no optical output. I would say Sonarworks is more important but that it's still very useful. There are commonly held reasons why mixing on headphones is not ideal, and NX seems to fix them. In fact I'd probably say that mixing through Sonarworks and NX on headphones is a lot better than mixing through monitors in an untreated room. 
 
NX definitely seems to help with ear fatigue as well. I find it's more comfortable to listen to music on headphones with it switched on - you don't have that "closed in" feeling. Although I do tend to bring down the ambiance level from the default slightly. It's well worth doing the head measurements properly as well. 

So there's been a new and very disappointing turn of events.
I made some rough mixes of songs I'm working on, and took them over to the studio where I'm going to have them mixed.  MY GOD, they sound awful.  The bottom end was boomy and overpowering, the high end disappeared, and instruments that were dominant were EQ'd into the background.  I was actually embarrassed by the product I'd brought in!
 
I KNOW this studio sounds good, the culprit has to be the mix on my DAW.
 
These demos were mixed with my Beyerdynamic 990Pro headphones, and Sonarworks was on the Master Bus with the corresponding "headphone file" to compensate for BD's "flavour."
 
 
* and yes, I did remember to remove the Soundworks software from the bin before exporting. 
 

What does the output look like on a spectrograph and how does the sound compare to a reference track?
That may give you a clue.

Another followup:  this one was a "Keyboard/Chair interface error."
I had a  compressor on the Master ProChannel (i never use that, must have done it accidentally and/or forgotten) that "adjusted" the frequencies.  
 
 
PS.  Thanks for offering to help!

I've been using the Nx without the head tracker and the only problem is now the straight headphones sound really strange and unnatural. And that's not a real problem. I like the Nx.

I just built a test project using Melda's Noise Generator and Autopan(so the sound would move around) and putting NX and Sonarworks plugins in different orders.  The order of the two plugins didn't matter, the audio matched exactly (inverted the phase on one nulled out the other). 
 
Not sure if with very quiet sources (or loud/clipping) there can be issues with the EQ curves causing frequencies to completely vanish but loud (but not too loud) pink noise being autopanned  (or not, tried it both ways) didn't show any difference.  This is with NX with it's default settings (no head tracker) and Sonarworks with the reference ATH-50X profile set to Flat.
 
After this test, I'm no longer thinking it matters what order you put the two plugins in.