I have 2 NTT about 5 inches I have not had a problem yet (knock on wood)..I have 9 dats (4 indo, 3 at, 2 Ntt) and the NTT are BY FAR the shyest and less stable then my others.. Im surprised someone said the ATS are hard to raise my 3 are pigs and seem like they would be indestructible...