I never really contemplated going on any particular diet when I finally decided to get off my bum and lose weight. I knew that I wouldn't be able to stick to anything too strict, and as I enjoy food, I didn't want to have to cut anything out altogether. So.....I just made a big effort to eat what I considered to be reasonably healthy, cut down on portion sizes a bit, and the biggest change for me - do some proper, regular exercise. The weight loss was slow (averaged 1-2lb per week, which I was more than happy with), but it did work and I lost 9st over 2 years. I've just reached the point where it's become blimmin' difficult to keep losing! I have a normal bmi now though, so that'll do me :o)
With a little determination I found it surprisingly easy to stick to the health-eating and exercise, so didn't really have any problems along the way. I know it's not that easy for everyone as people have different issues (particularly with food), but whether you have a little or a lot to lose, I am a firm believer that a change to a healthier lifestyle can work well!