I have Atlantis (with the great skins from Lime) but it still doesn't appeal that much to me as Oatmeal does. The available presets for Oatmeal made me wanting to start tweaking myself, didn't have that same feeling with Atlantis.
I have been thinking of just adding Atlantis to my kitlist but right there the collection urge creeps back in. I decided on just one real big/deep VA-synth and Oatmeal got the gig
But Atlantis is a great runner-up. Together with Oatmeal and Voyager I think these three synths smoke almost everything commercial on the market.