I have recently started on the Tesco UltraSlim and have done SlimFast in the past. I find the the Tesco one is loads cheaper but much less variety. They have ready made shakes in chocolate, chocolate orange or strawberry and powders in Hot chocolate, caffe latte, and strawberry. The bars are available in chocolate or (I think) forest fruits although my local Tesco only do the chocolate bars. As for eating them all in one go, you couldn't! They are like a marathon to get through and quite filling. I find they make me a little thirsty as well, same as the SlimFast bars. Obviously the SlimFast range is much larger but much more expensive too. Currently, the pre-made shakes for SF are about £1.58 each and sometimes £1 on offer. The price of the Tesco US is 3 for £2 for the cartons, 2 for £3.50 for the bars (3 per box=6 bars) and 2 for £6 for the powders which have 12 servings in each.
As for the error in the calorie content, that has now been rectified