I have not ordered a sexed bantam from them but from what I was told by them they guarantee the same 90% accuracy as they do with standards. They charge alot more for bantam sexing though since it is supposed to be more difficult. It is $7.00 additional per bantam chick for females, when it is only 50 cents for standards. Most of the bantam chicks are around $3.00 per chick. Do the math - if you want 10 females that is $100 in sexed chicks + $25 small order charge + $15 shipping (average guess), that comes to $140 for 10 female bantam chicks. For the same price you could get 42 straight run chicks since there is no small order charge. I would say it is based on your specific needs, but it is expensive.