I got a pair of ATH-M50's for $79..and I had $20 in coupons...
so they cost me $59...they do a decent job...

I agree, I can't afford $300 for a set of headphones...
I do the best I can with what I have...LOL

This is the problem when you are used to deliberately eq-shaped drivers and then you move to reference models. The previous sound you are used to disappears and also that they need a dedicated amplifier to get the best out of them. I'm just listening to a Rammstein MP3 with the EQ button enabled (Hi-Fi like smile eq to the output) and without being bias, you would need to spend a lot of money to get something consumer level to get the same quality.
 
If I could get the same quality out of earphones it would be fantastic. Well it is possible perhaps for a small fortune. As I am essentially a keen amateur I would rather invest within my needs.
 
Audio Technica were on my shortlist along with Grado, Sennheiser, Beyer Dynamic. Although I had AKG K271 Mk. 2 before which was my first step into higher quality headphones. 

I get some pretty decent mixes out of my ATH-M50's...

this was done with them entirely...

https://soundcloud.com/cclarry/shine-the-light-lws
 
It was a mix I had to do for a class I was taking in Pro Tools...

The M50's are great, as long as you remember there's somewhat of a bass boost. I also have a pair of Grado's and the two are chalk and cheese sound wise. The Grado's are much sweeter in the upper mids and highs, while the M50's have a firmer bottom (heh heh) and are flatter overall. I would listen to Steely Dan through the Grado's and EDM styles through he M50's, but I wouldn't use the Grado's for mixing because I don't think I could help myself compensating for the quieter bass.

I also have a cheaper pair of AT's for the gym, M30's or something like that. For the price (around $70 not on sale) they are surprisingly good.

sharke
The M50's are great, as long as you remember there's somewhat of a bass boost. I also have a pair of Grado's and the two are chalk and cheese sound wise. The Grado's are much sweeter in the upper mids and highs, while the M50's have a firmer bottom (heh heh) and are flatter overall. I would listen to Steely Dan through the Grado's and EDM styles through he M50's, but I wouldn't use the Grado's for mixing because I don't think I could help myself compensating for the quieter bass.

I also have a cheaper pair of AT's for the gym, M30's or something like that. For the price (around $70 not on sale) they are surprisingly good.

I agree Sharke...I had ATH-M40's and they were great...
The 50's were a steal that I couldn't pass up...and glad I didn't...
But if I had my wish...I'd wish for this...

http://www.sweetwater.com/store/detail/1038B
 
Only $8500...chump change...LOL

cclarry
I get some pretty decent mixes out of my ATH-M50's...

this was done with them entirely...

https://soundcloud.com/cclarry/shine-the-light-lws
 
It was a mix I had to do for a class I was taking in Pro Tools...

Pretty good, very nicely done.

Thanx Interp...

As has always been stated...having good source tracks is essential...
It certainly makes mixing much more fun and whole lot easier...LOL

I am wondering if this really going to be worth the investment. 
For example, if you also painstakingly created a EQ setting and then A/B the mix with the headphone correction. How do you tell if your mix is going to be "correct"?
 
Is it possible to create a bus mix, invert the corrected input and sum the difference (drawn as a waveform). The ideal output would be a straight-line with no very little phase difference. Why go to all this trouble? Something to chew on.
 

How do you tell if your mix is going to be "correct"?

 
Good question. You certainly aren't going to know with certainty based on what you hear in headphones alone, no matter how good they are.
 
However, by correcting your headphones' shortcomings, you can at least avoid tailoring your mix specifically to those shortcomings. That's really the whole idea.

OK. I couldn't really make out what frequencies are being boosted or attenuated in the display window for the graph in the plug-in display. Do you know if the graph is logarithmic or linear? I know there is a frequency response switch although I will still play about with the idea of this plug-in. 
 
In the grand scheme of things, it's certainly cheaper than acoustically treating your studio.