Questland Games
An Adventure in Gaming!
Galaxy of Heroes - Crystals

Some uses of crystals are wasteful, and some are smart.

Buying Chromium Data Card very early on could be useful, but as you unlock more characters, it quickly becomes useless.

In shipments, there are some rare gear pieces that are worth the price.  But if a piece of gear is easily farmable, then it is usually more efficient to use your crystals for energy refreshes.