Paul is looking for an HD security camera, where he could save and then edit the videos. Leo says the Google Nest cameras are good for that. They are very high resolution, but they use a lot of bandwidth upstream - 1 Mbps per camera. That could kill his internet in some cases. He may also have to pay for offline recording. He'll be able to download the video and edit it, though. That's probably the easiest way. Otherwise he'd have to wire the cameras to his computer and capture it directly.
Jeff's condo has been having several break ins and he's looking for a surveillance camera good enough to prosecute with. He's told that Wi-Fi cameras aren't good enough. Leo disagrees. Synology makes a good quality camera for an affordable price, and he's used DropCams (now called Nest) and they're good as well. They're 1080p HD and the quality is superb. It also helps if the area is well lit and the camera is positioned as close as possible. Nest Cam will offer online cloud recording for a monthly fee and Jeff could access it everywhere.