Yes, I have it and like it a lot, though I probably don't use it to it's full potential. The kit is quite easy to put together. I opted to get the SVGA large screen adapter, but I still don't have a large screen, and probably won't get one. I really don't think a large monitor is necessary for how I use the P3.
I mainly use it for two things. Since I mostly stay on CW, I typically keep the pan adapter set to a 40 kHz span (+/- 20 kHz). That way, when I change to a new band, I can immediately see if there is any CW activity present. If not, I can just switch to the next band. No more tuning around looking for signals. For rare DX, the panadapter is the cat's ass for busting through CW pileups. You can decrease the span, and really see who who the DX station is talking to when he is working split. I think that makes a world of difference, especially when you have limited power, and a limited antenna, like I do.
For SSB, I only use P3 for finding signals. I don't find it of any use for breaking split pileups, since they are not very spread out. And for the digital modes, I don't think the panadapter is of much use, since the digital software has a waterfall.
Overall, I really like it, and think it has been a great addition to my shack. But I also think it is primarily a tool for the CW operator.