Love it, love it, love it. I buy it 40 lbs at a time for the best savings, which makes it ~ $2.50 per pound...cheaper than that crap Wilton calls fondant!. 
I have made and used MMF before but enjoy not having the additional work of making it, nor liked fighting its natural elasticity. I found it sickly sweet as well.
That is the problem I've had with the MMF in the past hence the question on Satin Ice. My MMF usually turns out somewhat on the dry side w/o much "stretch" to it. Like spottydog said the SI seems expensive... I just really need to know all I can before I jump in head first with the Satin Ice. So far I think I'm gonna go for it and see what she thinks.
I just bought some Satin Ice today. I only bought 1 lb each of chocolate and vanilla. I just wanted to see how they tasted. I will probably try to use it on a very small maybe 6" cake to see how it turns out. I think the vanilla tasted really good, it reminded me a little of the taste of marshmallow fondant. The chocolate was good, not too sweet. To compare the taste to Wilton fondant, I would have to say, there is no comparison. The Satin Ice would win hands down. I will definitely buy more.
True it does seem to be on the expensive side, but most professional cake products/tools are. That's why you charge more money for fondant-covered cakes. Unless you have a very large cake, I've found that the smaller pale covers most cakes. But, buying the larger pale is more economical because you'll get more for your money.
Tara
Another vote for Satin Ice. Keep in mind that you can roll it out much thinner than the Wilton and it still covers and handles nicely so you use almost 1/2 as much which helps justify the cost. The same amount goes further. Most of the cakes in my gallery are Satin Ice.
Debbie
Love it, love it, love it. I buy it 40 lbs at a time for the best savings, which makes it ~ $2.50 per pound...cheaper than that crap Wilton calls fondant!.
Unless you have a very large cake, I've found that the smaller pale covers most cakes. But, buying the larger pale is more economical because you'll get more for your money.
Okay, this may be a stupid question, as I am very new to using fondant. But...How do you store the leftover fondant? I always thought that once you had opened the package of purchased fondant, you had to use it in a very short time or it would spoil. I have made MMF a few times, but if it can't be used in a few days, I end up just throwing it out. It seems like such a waste.
I wouldn't mind trying the SI, but I hate to have to throw away my investment, purchasing fondant is just so expensive if you only use a limited amount of it!
IME, Satin Ice lasts a long time if stored properly ~ away from air! I just take out what I need from the pail, twist the plastic bag it comes in back down so there's no air on the fondant, and snap the lid of the pail back on.
I love your signature, gmcakes!!! 
I just tried Satin Ice, I perfer pettinice. It is cheeper and not as sticky, I found it easier to work with....
With that said, Satin Ice is much like MMF, so if that is what you are used to, you may like it as well.
I have heard great things about Fondx, but I have never used it
I haven't tried Fondx but I did get pettinice once just to try it. It was easy enough to work with but I didn't find it to have much taste. Of course vanilla (SI) might not always go with your other flavors which makes the pettinice an option then. I don't find SI to be sticky.
SI is supposed to have a shelf life of one year. I purchased 2 of the 20 lb tubs for a wedding job and had found that I used so much left I only used one full tub for the entire wedding. I used the other tub for just over a year and it was as good after a year as it was when I purchased it. Like Cakepro said - just twist up the bag to squeeze the air out and snap the lid back on.
Debbie
I wasn't expecting to have that much left over. When I ordered the SI I ordered a "little" extra considering Wilton's useage guide and ended up with rolling it thinner having a lot left over! I was surprised how long it lasted too - and it never dried out or changed in consistency or flavor either. I try different fondants now and then just to try them but have stuck with my tried and true. I love the taste of chocopan too (white chocolate) but found it very difficult to work with.
Good Luck!
Deb
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