I am a long time user of Sketch and have often use Keyshape to produce animations. Using Flow though is a far slicker way to produce these animations. It's a truly impressive and solid app all round.

I would much rather see some of the additional export options included in the deal though as opposed to additional seats when stacking. I have no intention of paying a Pro subscription to access only these additional features. Sadly this may mean that the product isn't for me in the long term but I can still recommend it and see its value.