I had the HPD20 for a few weeks.
A killer sound set for percussionist and a great feel and sensitivity.
loading samples was another plus, so was the usb to control midi and it being an audio interface too.
I really loved it, and still feel bunmed I had to sell it.
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loved using it at the jam too.
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It can be used with hands and sticks equal depending on the settings used.
The Yamaha Multi 12 is a kiler unit too.
This one is better for sticks, has a more orchestral/asian sound set, and more midi options, but its bigger and really more aimed to the drummer/producer.