Hey Mele... (hope you don't mind if I abbreviate your name a bit - now I have that Bing Crosby song in my head!!!

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Don't worry about it - we aren't going to toss stuff at you. Remember one thing - the people that market SlimFat (and this goes for most of the other diet products out there) are experts at what they do...they know what to say and how to say it to make you go out and buy, thinking it's healthy stuff, when actually it is mostly sugar (the canned stuff has around 35g of sugar on average - the powdered stuff less but remember you add milk to it, and all milk has sugar in it). The thing that kills me is when they call it 'energy from carbohydrates' rather than just plain 'sugar'. Hoo boy.
I personally stay away from straight on soy protein, after reading up on it a bit. There is a history of breast and ovarian cancer in my family (my mom and great-grandma had both) and more studies are coming out saying that too much soy can increase your estrogen levels, causing a greater risk for such cancers. Of course new studies are coming out all the time...Myoplex Lite is a blend of whey/casein/soy protein which I think burns slower.
The one good thing IMO about GNC is that you can buy individual packets of MRPs and try 'em out, rather than spending a lot of money on something you end up hating. If you don't care for the taste of something, you're not going to use it, right? Also, I believe that Nutrition Express
www.nutritionexpress.com sells variety packs of different MRPs. I used to get their catalog all the time and I saw them offered frequently. I haven't ordered from them in eons, though, since Vitaglo is way cheaper!