You can ice with them easy enough, but as for trying the smoothing methods on them,I have found it doesn't work. So if you are really good at smoothing without the Viva method (or any other method using tools other than your spatula) you are good to go. I haven't tried the flowers with it, but imagine it isn't stiff enough for that either.
Also I have found a new flavor (well new to us here, not sure how "new" any where else) but it if your picky about taste as my family is, it gets thumbs up with them
It is by Betty Crocker and flavor is Whipped Whip Cream. It is lighter and fluffy and not so heavy as the normal vanillas or white frostings.