More and more suppliers (including Amazon with the Kindle, Apple with the ipod) are shipping gadgets with only a USB charger. This is ok if you always have your PC/Mac turned on but a pain if you don't have easy access to one, eg when you are travelling. USB adaptors/chargers take out the stress by letting you plug the USB cables in to the wall. What this Kensington adaptor does is let you plug in 4 adaptors AT THE SAME TIME in the same socket. Pretty amazing stuff, seriously, it is surprising there aren't more of these available.
We have 4 Apple USB chargers plugged in to it, making it an iPhone/Pod charging station and avoiding the usual fiasco where people bargain with each other to use the only available charger with reference to the lowest level of charge left!
Construction is very good quality, people may not like the fact the ports are downward facing but this hasn't bothered us.
Charging is slightly less than using a single plug so charging overnight works best of all, especially with multiple units. The charge isn't that strong for an iPad so I would really use the supplied one for this.
Overall, totally recommend this unit.