I did sureslim - from October 2005 until mid 2006 - I lost 23kgs in about 3-4 months - I went to the gym also a few times a week.
I had a weigh in once a week & they kept a complete record of how I was tracking. Once a month I was measured & this also was recorded. I lost over 40cms over my whole body I think.
The food was all good -
brekkie: 190gms low fat yoghurt, 100gms fruit, & seed selection. (other options including eggs/ cheese/ veges etc)
lunch: several choices but included a protein portion of between 75-120gms + veges + 5 cruskits or 2 slices of burgen soy & linseed bread.
dinner: protein portion (usually a chicken breast or tuna or small piece of steak - veges) - after dinner I would have another piece of fruit.
The blood test I had done showed a whole range of things, can't remember all of it but they determine your food plan based on the results (some people may or not be allowed red meat for X amount of time etc).
Also drank atleast 2litres of water a day.
You are meant to have a repeat blood test 3 months later to ascertain if your plan should be changed.
If you step up your exercise you are allowed larger portion sizes - they also have different plans for different lifestyles.
You get given different options for meals on this chart thing and you can pick & match up what you want.
At no time did I feel misinformed, uninformed or like I was damaging my health. I also felt like I got what I paid for - the $900 included all my consultations, blood tests etc.
Sadly I stopped doing it properly when I started partying a lot - I maintained my weight & lost a bit more during this time. In the last 6 months I've started to put weight back on so I'll be going back to my sure slim (I'm not going to bother signing up again because I already have a fair idea of what is healthy & what is not - I'll also modify my diet to meet my own needs)