I learned on 3 and currently design in 5.0. I think there are many more things to 5.0 then in 3. I have really enjoyed the upgrade. My only complaint is that I cannot get Atomic Cupcake actions uploaded in 5.0, I am currently working on this!

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Karie
Mother to Mekaila, Kaimen, Naome & "fur baby" Titan
Wife to Gene