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I do not own and have never used an Aerus branded vacuum cleaner; however, I have several late 1960s-1990s vintage Electrolux machines and I love them. They're powerful, quiet, durable and well designed. If Aerus has managed to maintain the quality of their present lineup, then that's great.
If your question was referring to Aerus as a company, I don't really have an opinion since I've only had dealings with one dealer to get the handle/switch/cord assembly replaced under a years-old safety recall on my Genesis LXe upright. The guy was pretty nice about it, although I would have been happier if Aerus had just sent me the replacement handle. Also, the rocker switch on the new handle isn't right. It won't turn on in the 'I' (straight suction) mode unless I turn it all the way to the 'II' (carpet) mode first and then back to 'I'. I prefer the old Discovery II style slider switch, which is what the Genesis originally had.