ummm lol unfortunately Im a bit of an old pro, although usually just trying other ppl's shakes
Celeb Slim- pretty filling, VERY sweet, sickly almost
Tony Ferguson- Very filling, yuuumy flavours
Optifast- Very filling, ok flavours, (but cheaper than the above 2 brands)
Optislim- Practically identical to the optifast ones
UltraSlim- Very powdery and left a yucky taste cheap though...not filling at all!
Fatblaster Shakes- Found them to be filling, but a little blah
Hope Ive been some help