Lux worth buying?

Is Lux worth playing and buying for both mid and supping? (We're talking about low ELO here, but is she rewarding and a potential champion to climb with?) I really feel like buying Lux, but I'm just afraid to buy any champion of/above 3150ip, because I recently bought Azir and I changed my mind about him and never played him ever again. *Edit. I know and knew Azir is really hard to play/master, but I had a lot of fun with him once he was in free rot. + I had a hextech skin of him so I thought he would be worth buying.
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