I'm another newbie to Slimfast (although actually going for a gastric bypass, but trying to loose weight before the op to shrink my liver). I thought I'd give Slimfast a try, so picked up a couple of the cheaper tesco variety last week. Tried them and they made me feel really full. I had to wean myself onto them. They say you can have three in a day and a proper dinner - no way. Two tops for me or I'd be sick.
I also don't like drinking plain water. Today, all I've had is three cups of tea, two shakes, a wholemeal banana sandwich and minced beef, new potatoes and lots of veg for dinner (but couldn't finish it all). I don't tend to drink a lot otherwise. I know I should but I don't feel thirsty or anything, nor do I feel dehydrated.
Actually prefer the tesco lighter choices shakes to the slimfast ones, as they are thicker and fill me up more.