I read a post somewhere a while back that analysed results with the potions, and it turns out that the 100% ones are profitable with both beta and orb packs. So I bought both the 100% legendary one and gold one to use with my 100 beta packs. Was pretty happy with the results. I got a GFL, a GF epic, and 2 legendary summoners.
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ahhhh that is not bad!! i need to continue to try my luck