I have always fed them. Not as a staple or anything, but i have always used them and never had a problem with them. I don't feed them to hatchling leos or very small hatchling beardies. I have actually seen a hatchling leo choke on a mealie, we had to remove it from his throat, it was almost as long he he was! The beardies seem pretty good at crunching them up, so choking isnt a problem.
The other problem i have heard with Mealies is that they contain to much Chitin (spelling?) which is hard to digest, especically for babies. The freshly molted mealies, the white and squishy ones contain less of less, so feed those when you can.
But as I was saying, mealworms have always been a small part of my feeding routine on all of my lizards without any problems
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1.0 green iguana-Deitrich
1.1 Common Boa-Un-Named, Ursula
1.0 Ball Python-Anabell (go figure!)
1.0 Red Tegu-Uteg
1.0 Albino Cal King-Pig
0.1 Mexican Black King-Morticia
1.1 Bearded Dragons-Unnamed, Hanabil
1.0 Albino San Diego Gopher-Unnamed
0.1 Hermans tort-Esio
1.1 JCP-Milton, Medusa
1.1 Reverse Okeetee Corn-Unnamed
0.1 Snow Corn-Unnamed
1.0 Hypo Okeetee Corn-Unnamed
0.1 Motley Okeetee-Unnamed
1.0 Western Hoggie-Wyrm
0.0.1 Rose Hair Taruntla-Unnamed
2.0 Leopard Geckos-Reptar, Pogo
4.1 cats-Tucker,Poe,Abhib,Emerald, Felicity
0.1 Bullmastiff-Asha