Raman measurements on the quasi-1D Ising antiferromagnets CsCoCl₃ and CsCoBr₃ are presented. The magnons in both systems may be described by a spin-¹/₂ model and exhibit most interesting quantum features. These features are discussed in the 3D ordered and in the 1D short-range order regimes. Due to the hexagonal structure, 1D phenomena may be studied even in the presence of short-range order. Most of the effects may be described very satisfactorily by a recently developed theory, apart from strong magnon-phonon coupling in CsCoCl₃. A set of parameters describing the magnons in these quantum systems is extracted from the data. It is suggested that 3D cooperative phenomena are still present in the 1D regime.