There is a bit of overlap between this and Sealed In.
I personally like the illusion of penetration better on Impervios dvd.
Sealed was a little to rapid and juggle like to me.
Impervious is easier too, but this is because of a move they got from Sealed, but Sealed likely got it from Abyss (the first one).
I am intrigued by the new Abyss (big coin/sealed bottle) and I'm thinking of getting it.
http://www.magicshop.co.uk/abyss-revolu ... -1622.html
Its apparently more practical and looks impressive.
If you already have Sealed, then Impervious may not be a huge difference to you. If you don't have either then you're in good shape with either of them. Abyss looks like a strong one to consider as it is quite different than those.