haha, My sister-in-law would be one of those who absolutely needed one and only used it for around 3 months.
They can be good workout units, but you have to make sure to have it at a high enough setting otherwise you are just having momentum spin your legs and you aren't really working out as well as you should be.
They are more of a female workout unit though, I know a lot of women who refer to men on them as prancing fairies.
With summer coming (already here) I would wait until the winter to get any unit. There is no reason that someone can't go for walks, jogs, cycles, etc. outdoors in the nice weather.
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