I have some insight on my SE700's that I shared in a comment here. "Tak" did a fine job with the review. Now, for your ear pads. I recently removed my original pads that had flattened out quite a bit. I think some are under the impression that in new condition they are circumaural, i.e, encompass the ears. Actually, they are supra-aural--pressing on the ears. This made them a bit uncomfortable after a while. When I peeled them off, I also noticed the pads had been blocking many of the holes that deliver sound. That alone essentially changed everything about the sound of the headphones.
So, when searching for new pads I was intent that they were truly circumaural. If you've removed your original pads you will notice the "seat" is a tad recessed and is 3 ¼ inch diameter (82.55mm).
The replacement pads are larger by a few mm but they are very comfy. They are Shure replacements for the SRH750 headphone. The challenge is applying the pads to the headphone. I suggest a double sided adhesive or glue dots/strips (available at Michaels). There's also the adhesive velcro product that I have not tried yet.
Last week I found another source on eBay and I expect them to be a much better fit for the SE700 as they are 80mm (31/8 inch) diameter. When I receive them, I can let you know how they work out. The seller was very helpful in suggesting a match.
The price for either of these is about $15 or less shipped.
Probably more info than you expected but hope it helps.