• Hmm, the 3 month claim that is also in the otherwise interesting Wikipedia page is not well sourced.

    There are certainly faster transfer orbits that make 3 months possible, but these ion-drive engines usually need so much electrical power that it becomes a scaling issue, as you end up requiring a nuclear reactor which makes the ship even more heavy and so on. I think there are some calculations for other type of ion-engines and the ships ended up huge, making the concept at least for Mars missions impractical.

    But the relative simplicity of this one, together with recent advances in miniaturizing nuclear reactors might make this feasible after all.