Hi, I'm Sharyl, and I'd like to share my experience, I revised from an RNY to a DS in December 2011.
The RNY revision is the most complicated surgery of them all and there is a lot to consider before moving forward. There is a very short list of vetted surgeons who perform the RNY to DS revision.
Dr. Rabkin, northern California
Dr. Keshishian, southern California
Dr. Elariny, Virginia
Dr. Roslin, New York
Dr. Buchwald, Minnesota
Dr. Greenbaum, New Jersey
Dr. Stewart, Texas
Dr. Simper, Utah
Personally, in terms of a revision, I wouldn't recommend anything else but revising an RNY to a DS; I strongly believe the DS is the far more efficient sleeve/malabsorption combo, as Dr. Roslin describes in his excellent keynote here.
I had a total of three consults/opinions to further educate myself, in addition to finding this group, DSfacts.com, reading, researching. I personally ruled out the band over bypass or revising the RNY to a distal (I had a proximal).
I also want to note that I turned to a revision after exhausting every channel imaginable - I could not get/stay below 200 lbs no matter what I did, and I was very disciplined about diet, eating, and regular exercise. It was brutal and I realized that I was in the same yo-yo life I was before surgery.
How much we can eat is not an exclusive determining factor as to whether or not the surgery is functioning correctly, in any of the surgeries, generally, that ability does increase (there are exceptions, you will read people here with very 'tight' DS sleeves). And while we are not meant to diet forever, never have favorite things (I love cheeseburgers, pizza), using the choices you mention as a measurment barometer, probably not such a good idea
It's easy anyway to consume far more volume of any fast food because the grades of meat are so much lower, the deli meat processed, so you're not getting the full nutrient benefit as you would eating real hamburger or turkey breast, ham, roast beef etc on a sandwich.
Here is a link to my 6 month update (which was June), and it has links to my early post-op updates too:
Other screennames of revisions you can research posts: smileyjamie, msvee, chicarita, cathy811, mlleelise, peggy, mscello, and there are other veterans too. I have been fortunate to have a very smooth experience, but many others are having complications in their healing process (I did with my RNY).
Dr. Roslin's excellent keynote on Revisions: Does the procedure fail the patient or does the patient fail the procedure is super informative: