Right so Annie pads installed and having listened to tracks that I know have excellent positioning of vocals and supporting vocals/instruments I've come to the same conclusion that many on Head-fi have. If your Q701s are bass modded then using the Annie pads will make central vocals too central and diminish some of the soundstage.
To my ears using the pads on my bass modded Q701s I found that they lost that intimacy and highlights of each track no longer kissed your ear drums. They lost the character that makes the Q701 so enjoyable. Putting the stock earpads back on resulted in that intimacy being restored
I would advise people to demo for themselves if they ever get the opportunity and not just take my word for it but I will be selling the pads on.
They are way more comfortable as you'd expect being memory foam and they just hug your head so good just like the X1 did but sadly for me the most characterful sound and wide soundstage comes from bassmod + stock earpads.
I didn't notice too much increase in bass. My cans are port modded anyway so perhaps it's much of a muchness. maybe a tiny bit more bass but the loss of character was what stood out the most.
It's worth noting the Annie pads are the same thickness all round whereas the stock Q701 pads are thicker on the rear half of the pad that sits behind your ears. I imagine that a lot of the sound character going missing with the Annie pads is due to the thicker rear section angling the driver in such a way that the stereo imaging is just better and I would bet someone else's left leg that if AKG released a memory foam earpad with the thicker rear section that they too would sound amazing on the Q701.
Pics:
So a few reasons why someone may prefer the Annie pads over stock:
1: If they didn't like the super wide soundstage from the stock Q701 pads.
2: If they have not opened up the bass port hole yet.
3: They don't care either way and just want the extra comfort and bass.