I have a rather severe allergy to crickets. So I used to order a box of 1000, gut load them on mixed veggies, smashed dog and cat food, and rodent chow, for 24 hours then dump them all in a zip lock bag and freeze them.
When feeding time came around, I'd take out the appropriate quantity, thaw them, powder them, and offer them to my leos via forceps (I used the forceps for my own sake because when fed by hand some of my larger guys would grab my finger along with the cricket). Since each leo had to be fed individually this method took up a great deal of time especially as my collection grew. This is largely why I made the switch to mealworms.
I would occaisionally feed my geckos canned crickets in this manner when my cricket shipment was delayed. I did not,however, ever consider using canned crickets as a staple because there was no way to ascertain whether or not they had been properly gut loaded.
Hope this helps,
Alice