You guys are funny. First, IC Realtime is not the only source for Dahua's. They are about triple in price what you can buy them for elsewhere. Second, to add to the quality of the unit, I've replaced Speco, Everfocus, Ganz, and some others and the quality of the Dahua is amazing.
I have about 100 Dahua's in the field. I've never had an issue with quality. Our recent installation was four 16 channel hybrids, 16 channel analog and 16 channel virtual for a total of 32 channels each - grand total of 128 cameras. We have used the loop out on all four at a distance of over 120 feet and terminated them on baluns to RCA's. They are on fairly inexpensive 32 inch flat panels running 480i. No problem. We also have some cheap Everfocus quads that are looping four cameras each from various of the four DVR's to monitors 100 feet away. No problems.
Last, if you want to view your Dahua's on Iphone, Ipad, or Android without paying through the nose for IC Realtime's app, check out IPCAMVIEWER by Robert Chou. It is under $5.00. The biggest difference between the apps is that the ipcamviewer brings up all the cameras at once. The drawback is that you have to install each of them in the app. However, you only have to do that once. You can have hundreds of cameras come up at once if you want but I wouldn't recommend it - slows down big time.
Nite.