I imagine yeah, each added feature, fan, thermo etc. adds ease of control.
You'll need some way to keep it cool though, so I'm not sure how you'd get around the ice [EDIT

ops, you meant ice chamber, I think you'd have to be careful to get even cooling all around).
[EDIT: this sentance is irrelevant, I misread the post] that beer is making it's own heat, so just sticking it in an insulated box will actually make it warm not cool.
I guess it depends on what your brewing and what temp your trying to hit.