I have to assume that all wheels that come on bicycles are machine built, so I have no problem buying a machine built wheel. When I do, I'll do the same as I would from a hand built wheel and spin it in the bike, looking at the brake pads, to make sure it is true, and pluck the spokes to make sure one or two isn't really loose. I have spoke wrenches, and so should you, and will fix any minor issue before it gets worse.

Building wheels can be tricky, but keeping them true is pretty basic. Watch a couple of youtube videos and you should be able to get it no problem.