CGD (Crested Gecko Diet) or MRP version as mentioned before is a complete meal system. You can raise from cradle to grave and even breeders on nothing more than ample supply of it.

For our geckos we tend to supplement crickets (gutloaded and dusted as you would for a leo, in fact, the T-Rex leo multivitamin supplement is the most recommend for cresteds) for our juvis about once a week instead of that meal of CGD. Not necessary, but we feel it helps them grow and the weekly Jurassic Park raptor feeding scene is worth the price of admission. I think almost everyone here has those rustling leaves stories.
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0.1 Albino Leo Gecko
0.1 Crested Gecko
1.0 Dear Boyfriend
Departed: Harvey and Spock