I did not want to submit a review within 5 minutes of opening the box... I have had this keypad for three weeks, and it is easier than using the PS3 controller to enter text in Playstation Home. The keypad clamps over the controller, is light and well built, and does not make the controller awkward or unbalanced. There is no USB cable packed with it. From full charge, I have got about four days use from it (based on between 3-4 hours use each day).
I have large hands, so can easily reach the keys, however, the keys are small. It takes a little getting used to when entering other characters using the green and orange shoulder buttons on the keypad. This keypad does not replace a full keyboard. It is ideal for quick messages, web browsing etc. For long typing sessions, you will need a full keyboard.
The track pad function is not very responsive, so I do not use it as the sticks on the controller are better at this aspect. According to my usage over the three weeks I have had it, here are the pros and cons:
Small and light
Fits nicely onto the PS3 controller
Excellent for use in Home and during gaming
Small keys. People with large hands may find it tricky when typing, unless you are accustomed to using a Blackberry mobile phone.
Track pad option is not very responsive
What I would like to see in a version 2 of this Keypad:
Slightly bigger keys
Backlighting for low light or dark conditions
Improved track pad
In short, it is a very good device and I recommend it. If you have large hands, it is worth trying it out first if you can before buying one.