I've used it before at home and it was fun but it came out horrible. I thought it was because I made it. Bought some and tried again, same results.
Finally signed up for a fondant pillow class...and it actually came out well. The teacher was impressed with my creativity and gave me some help along the way:
-it needs to be rolled out evenly (and larger than the size you need). You can buy those rings that go around your rolling pin to roll things out evenly OR if what you need is not that big you can use something the thickness you need on either side so the rolling pin doesnt go all the way to the table. (for example, paint stirring sticks but I think these are too thick)
-you need to make sure that buttercream underneath is as even as possible. You can use a slightly wet "scraper-thingy" to help even it out if there are still lumps when it begins to crust over.
-cornstarch is your friend
Of course, the main reason I was having trouble...my home. Like, MY home. The cake I decorated in class came out super cute technique wise (they had so many students fondant ran out so I ended up with different colors). I took it home so excited to show my partner. Had to wait about a couple of hours for him to get home from work. When he did, it was a mess. I realized the class was in an air conditioned place. I live in Puerto Rico. It's hot as he77 here. PLUS, my house itself is hot too. So, the problem I was having was that it was too hot to work with fondant.

So before I work with it again, I have to invest in a portable a/c at least.