I have a device (purchased in the UK) that appears to be the same as the one offered by New Egg. It will charge an iPad plus other devices simultaneously, but I must attach the iPad first. If I attach my phone first, the iPad will report "not charging", but if I connect the iPad first I can then connect others and the iPad will continue to charge.

One nice feature of this product is that the detachable plug adapters use a "figure 8" socket, which means a standard cord can be used instead of the supplied adapters. This is useful if the power outlet is inconveniently located, and can be cheaply replaced while travelling.

As a practical matter I would not travel with a single USB power supply because I would be out of business if it failed or was left behind. I carry the small 1A adapter that came with my phone in addition to the multiport charger. Typically I use the 1A charger for the iPad, and the multiport for whatever else I have. Yes, a 1A charger works fine with the iPad.