I have seven. I planned on keeping my analog Dvr in line and just import the ptz channel into a channel on the nvr, which would fill out the nvr to eight channels. This was three years ago and I had really just invested the bucks into the analog ptz and the Dvr from security camera king, so I didn't want to pull that stuff out at the time. But I invested in the dahua nvr and seven dahua 3mp cameras, one being a 4300c and the others being turrents that I'm sure are great because I checked them, but they are no longer produced by dahua. That was three years ago. Currently now, I don't mind pulling the Dvr out and also replacing the analog ptz. So I'm on the verge of a complete new install of my three year old gear that has been sitting and waiting, lol. My back has to agree though, and that's the trick. I have two opertunities a year, spring and fall. No way I can take my attic in the summer. Hopefully this is the year.
If you really want to know why I've stalled for so long, it's that my analog system still looks good. For all that megapixel can provide, let's be honest here, it's only giving a high definition image of suspects hiding their identity in the first place. We know this. It's mostly a losing crap shoot, this game of catching a thief on camera. But of course, I'm invested and on board with megapixel, if only I'd install it!
I digress, sorry.