Marcel,
well mine are quite good.
I am keeping 2.2 of them and 1.2 are adults and none of them are nippy. The samller one is a bit or less more flightly but not that bad.
I know that they have a reputation of being very nippy and bity but luckly mine are still alright.
But as hatchlings, they're mean as can be.....and you can hear them hiss even if you're in another room. They're pretty good with hissing and biting when small. Adults? Well mine are good.
I think that they're great looking snakes!!