hy mx45vae is a 3 axis machine ... do you wish to buy a full 5axis cnc or you wish to simply put a divizor with 2 axis on the mx45vae ?
is not so common to begin with machining in full 5 axis thus is not as simple as on simpler machines, but is not impossible
be carefull that control may be filled with settings that are not always required during a setup : this may lead to a lot of time required to understand those "extra functions", just to simply reach the conclusion that you dont need them
i dont know if what i said is true for osp-u100l, but i can tell that newer machines are more complex
maybe you shoud think about a 3+2 cnc, thus a rigid mill + divizor, instead of a full 5 axis ...
if somehow you have a guarantee for part that are to come, that this may help you decide ... otherwise, getting a full 5 axis cnc may involve some risks
... just some morning thoughts kindly !