I got a cheapo multitool from Aldi years ago. It does come in very handy from time to time. One thing I would say - the sanding sheets attach to it via velcro. That is, the base has velcro hooks, and the sheets just have a kind of cotton wool fluff. That fluff very quickly wears away, so I find the sheets become useless because they won't stay attached a lot sooner than the actual sandpaper wears away.
Because of that, I've switched to a B&D mouse* for the sorts of sanding tasks I would have used the multitool for. But it still comes in handy occasionally as a plunge saw.
*Which actually still uses a velcro system, but the backing seems a better quality and lasts longer.