I switched from Dropbox to Aero for all my home computers (of which I have Windows and Linux desktops and Mac laptops) and the unlimited storage (as much as your home computers can hold) is great. Plus the files are only synced within your own computers so security/privacy is much better than uploading all your files to a public service like Dropbox.
The only negative as compared to Dropbox is that their client is not as efficient (it's Java based and takes a bit more resources than Dropbox).