Well, $400 for a mic calibration with SXFI amp meant that the calibration for the amp costs almost as much as another amp.
Paying $200 just to get maybe 85%-95% accuracy compared to 60%-70% accuracy with the phone app is not worth it.
Also, we do not own the mic calibration kit. It's only a one time utility that we gain from it and there's no way to redo the calibration on our own if required.
Yes, there are operating costs for Creative if they provide this service to customers, but if they are asking twice the amount, I will just stick to the app.
Here's the thing. $400 was just a number that was randomly tossed out as "maybe", so we shouldn't start writing as if its that price. For all we know, it could be lower (or, of course, could also be higher).
As for whether it comes with an SXFI bundled, nobody knows. The price paid for mic-calib (assuming there's a price) might just purely be for the service post-sale.
As for accuracy, well up to you to believe, but my app-mapped profile is pretty close to my mic-calib'ed, except the latter accentuates the front L/R speakers slightly more, making them slightly louder. In terms of speaker or directional positioning, both worked quite equally well.
So I would say app-mapped gave me a 80 to 90% while the mic-calib'ed gave me a slight bit extra.
If you can, do another app-mapping with the following:
1. find a bright area
2. your ear/face should be facing the light (tilt your ear/face slightly up toward the light source if you have to)
3. camera-app should be 90 degrees perpendicular to your ear/face (alignment is very important)
4. Make sure no shadows fall over the ear/face from the camera which would be between the ear/face and light source
My biggest improvement actually came from headphone profile selection and EQ-tweaking.