Personally I love it.
I have a shake for breakfast and a hot and savoury followed by a second shake for dinner (I'm not a lunch person). I was steadily losing weight before christmas, and I'm down almost 4lb since 1st Jan.
They do powders, hot and savoury and bars. The powders and the hot and savoury are 400kcal per portion but they are a good size and as they only need water you can make it up to whatever measure you want. The bars are 200kcal each.
Powder versions are white (standard) or black (more protein and less carbohydrate) and both come in a variety of flavours.
I've tried white banana and coffee, and black chocolate and coffee caramel. I don't have an overly sweet tooth and found the banana a little too sweet for me - but then again my partner loves it and adds a tsp of maple syrup to his. The coffee ones (black and white) are amazing - like drinking coffee flavoured nutty melted ice-cream.
The black chocolate was not nice (possibly due to the pea protein used to up the protein content) but they are changing the recipe soon as a lot of people have noted this about black chocolate - apparently the white version is way nicer but I've not tried it yet,
I really don't recommend the bars - they taste like cardboard - I tried chocolate and white choc and raspberry. Horrible!
Hot and Savoury are great. They come in a variety of flavours and are more textured - think vegetarian chilli / curry. Add boiled water - again like the shakes can be made thicker or thinner to preference but changing how much water you add - then cover and they are ready in 5 mins. Mexican is my favourite, thai is nice, tomato and herb a little bland. Really looking forward to trying their three new flavors next week.
Sainsburys do the ready to drink bottles - which would give you an idea of white version standard flavours, without shelling out £50 min spend to check the taste. Note these will be slightly smoother than the make at home powder.
If you do decided to buy something meeting the minimum spend - you can then add individual bags, bars etc to try.
My best tips are:
Make it the night before giving it time to thicken.
It's nicer straight from the fridge.
Use a blender to really make it smooth.
Replacing 100ml of a shake's water contact with milk / alternative is divine.
Adding a tiny amount of goat's cheese to the mexican H&S is also divine.