i advise the cricket crack, http://tikitikireptiles.com/products.php?id=16; i believe in having crickets eat good stuff and keep it in their bellys constantly. i add in veges regularly with this for the dry food. but i guess i dont nessasarly "gutload" either.
Your feeders are what they eat. I too always feed my feeder insects a good gutload. I use cricket crack/apples/oranges/yams/collard greens all of the time. Sure the commercial cricket food will keep them alive but they wont be as healthy as if they were always fed a nutritious diet.