I've been overweight most of my adult life, usually 2-3 stone overweight and I've done every diet under the sun, WW, RC, Atkins and SW.
I lose weight on all of them so they all work if followed correctly. Atkins was the most dramatic but oh so unhealthy (for me) but SW has worked so well.
SW is the only "diet" I have ever reached Target on and the only one I have ever maintained that weight on. I put a lot of that down to the fact that I still go to group every week after 2.5 years but I go now to help others, to help the consultant and to help myself stay at that weight.
The Extra Easy plan takes so much restriction out of the red/green plan and is great for new starters, there's not much weighing and measuring, only cheese/bread/cereal/milk for example - so much food is free. It's simple and fits in well with family life and eating out, not many plans do that.
Like I said though, SW works, I'm living proof that it works
but then all the other diets work if they suit you!
Give it a try, go along to a group, it's worth a tenner to have it all explained to you and get all the info.