The high gloss polishes very well, as that is what it is made for. Also it will strip with MC based strippers. As for the polyester, it's very easy to work with and also sands very nice and best of all almost nill shrinkage. Performance of both products is outstanding. If you never want to age, then formaldehyde is the way to go.
Frogs float in it.
OK, the frogs are dead. And the age stopping process also kills you, but there are tradeoffs in everything, especially in the finishes that we use and the ways we apply them. The downsides of the ICA filler is the cost is much higher. The potlife is significantly shorter. But for ease of application, reversability, and performance, ICA is a winner.