Is it worth buying an all-in-one PC?

I want to replace an old eMachines PC from 2002. I would prefer a desktop with a flatscreen like the one I used to have at work, but have seen some all-in-one machines that seem very tidy. Are there any downsides for a golden oldie who really only uses his computer for email and internet browsing? Bill Howat All-in-one PCs have been around for a long time but only the Apple iMac versions have ever sold in any volume, possibly because Apple doesn't offer the sort of cheap mini-tower systems that are popular with Windows PC buyers

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Is it worth buying an all-in-one PC?