I've seen similar discussions but I dont have many good characters and I am lvl 53.(F2 P)
Down here my best characters
Kylo Ren 4*lvl53
CW chewbaca4*lvl50
Tarkin4* lvl50
Talia3*lv 48
Jedi consular3*lvl48
Ackbar4*lvl50
The other ones are useless
The chromium packs are not for normal players farming, but if you don't have 7* toons then it won't be a waste, but it may not be the best use of your crystals.
What kyno said generally your best use of crystals is on energy refreshes because that will help you level up as well as building up characters. Saving up for gear for later can also be helpful as that becomes a major crunch at higher levels.
U will have more benefit if u buy crystals pack and buy energy refill. Kylo is good choice.. u can refill cantina energy max to 3x (100x3) = 300 crystals a day. Kylo is at 10 energy mode, with 3 refill/day u can get his shards about 7-15 shards a day.
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Plz don't insult EA.. there is never 3 - 330 pack, but 5 - 330 pack