It's not just that. No matter how amazing drivers and matching can be, nothing is going to beat a virtual surround HTRF that is custom tuned to match your own ears. We can look into this in the future, but in general, most headsets use a generalized HTRF for virtual surround applications.
You can take a $5 garbage iem, apply a good HTRF virtual surround DSP, and it'll be better than any headphone in existence that is stuck in plain stereo in terms of providing an immediate accurately placed audio cue. Nothing beats having actual localized positional cues. Raw, unprocessed stereo will never give you an audio cue that is supposed to come say... 45 degrees behind you to your right, in that spot. It'll just be some slight deviation from linear right.
Turn off all surround processing on any headphone, play some call of duty, close your eyes, and spin your character around. then have someone near you shoot in the air. Without you opening your eyes, you will not know if the sound is in front of you or behind you (with experience, sure, the sounds are different enough, but it's not the same as with proper virtual surround cues, where the difference is immediate. The sound will be as if it was actually behind you.
While we include Dolby Atmos license for Maxwell Xbox, and Sony utilizes Tempest 3D audio, there are many other surround DSPs out there that may suit your ears more.
Waves 3D
Sennheiser GSX surround
Creative SBX
Creative THX Tru Studio
Dolby Headphone
DTS Headphone X
Windows Sonic, etc, etc.
Beyer Headzone
Darrin Fong's OOYH
Ryan Redetzke's Redscape
Some are PC only, others are included in external devices, etc.
That's how you will get the best location accuracy improvement, over just throwing your money at the best headphone in existence.
I'll take anyone with a $50,000 headphone in raw stereo, with a Maxwell using Atmos, and I'm confident that I'd easily be way more able to tell where something is in a virtual space much quicker than the 50K headphone.
Why, because there's my brain doesn't have to guess if something is behind me or not, the audio is already positioning it there, as opposed to unprocessed stereo.
I can only speak to myself, but I HIGHLY disagree with people that think all you need is some uber stereo headphone and thats it. No. You need good surround audio processing as well.
In terms of Stealth Pros or anything else, it can come down to your own ears, the frequency response difference, etc.
One person will say imaging/soundstage is ok, another will say it's excellent. We all hear differently. Before writing off any headphone and throwing money at another headphone, try other surround processing apps/devices. They may have DSP more suited to your tastes.
Anyways, this is just my own two cents, my opinion, take it as that. I made that argument long before I joined Audeze too. A great headphone will obviously benefit you in other ways like clarity, and enjoyments, but in terms of positional accuracy, the meat and potatoes lies in the surround dsp performance and how well it suits your own ears. For those that say meh, I like stereo. Well good for you. I like people like you, because I can pick you off based on audio a precious few moments long before you will.