Some travellers have suggested connecting Converters to a Power Bar, so that multiple devices can be charged at the same time. NOT something I'd recommend for two reasons:
1.) It's easy to exceed that rating of the device if connecting multiple appliances, and some Converters use a non-replaceable Fuse; if the user "blows" the Fuse, they'll be without the Converter for the remainder of their trip (some of the newer ones have solid-state protective circuits).
2.) If connecting multiple appliances to an "auto sensing" Converter using a Power Bar, the device might choose the wrong conversion method, and damage either the Converter or the appliance.
One other thing to mention is that Voltage Converters are often equipped with "Euro" Plugs, so if one intends to use them in the U.K. or other locations, then a Plug Adapter will also be required.
Many electronic products these days are supplied with "world chargers", so a Converter is not required as often.
Hope this helps!