Hi there! New user here from CT. A friend recommended this brand of drone to me so I'm checking into the idea of getting a p3 or a p4. To those who have already taken the plunge, are you happy with which you chose? Aside from more $$$, are there features to the p4 that I actually "need" or would be sorry I didn't spend the extra for? I'm leaning towards a p3p used, preferably with all the extras, and have been lurking in the classified section. Thanks in advance for the help!