If I decide to do so I would purchase a Full version from an online retailer - based on prices I paid for full versions of S10/S11 it is very likely that the Full version of S12 will go on sale somewhere for less than the cost of an Upgrade version from the Pinnacle e-store!
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I agree when 11 came out Pinnacle were offering so call discounts on the upgrade, but I purchased a full version from Amazon for about £15 less.
I still thing I will wait and see if its worth it and that there are no bugs around.