We own a KP2 and I recently had a dabble on the KP3 whilst in oz. The KP3 wins hands down on a direct comparison. Better build quality, more effects, more responsive... etc. I have never experienced an original KP so can't comment on that one.
The only reason we haven't changed up yet is cash, they are simply much improved.
Hello, Sophie! Your PM box is full, so I wright it here, I need to contact you)
Just wanted to make you an offer to collab on Drum & Bass track. You can check my work on my page soundcloud/mjramon
Here are some examples:
(sorry for those "links", URL restrictions)
There are also tracks beside Soundcloud. Just let me know, if you'd like to make a good song. It can be released then in Point Audio label (USA).