I usually buy it, 'carma massa ticino tropic' is the only brand I will work with now. Unless I am in a pinch, then I will get satin ice, since it is sold locally and carmas is not.
It's not as sweet as typical fondant, and is a dream to work with.
Personally, I hate marshmallow fondant, but I have been getting a lot of requests for it lately, since people read online that it is supposed to taste good.
I find it over the top sweet, but I'm not a fan of really sweet things, so that is a totally personal preference.
It is super cheap and easy to make, and my experience with it has been that it's easy to use.
The best thing you can do is experiment, different strokes for different folks :)