I've been doing Intermittent fasting since November, and have lost 12kg so far. I do find it very easy, and even now still look forward to fast days. I choose my busiest days as fast days, never on the weekend, but days when I have something on in the evening as well. I haven't ever felt weak from it. I do get hungry from time to time, but I know being able to eat in the morning helps.
Actually for the last 6 weeks I've been doing 4:3 and still find it very easy, and my weight is dropping quite a bit faster than before.
I lose about 500 grams a week typically, but sometimes I lose up to 1.25 kg a week.
I was 117 kg when I started, was fairly overweight, but have always been fairly stocky, my aim is to get down to around 86 kg, and wouldn't want to lose more than that. I'm now at 105 kg, and plan to continue the 4:3 until I get down to around 95 at which point will start back on 5:2.