I've dealt with EasternCCTV in the past - the last big analog jobs we did, we purched a number of these and these and these from them. Makes life very convenient when you have a mix of large numbers of IP and analog - run UTP everywhere, terminate it all in a patchbay, RJ45 plug at the camera end, and if you ever replace an analog camera with IP, it's a simple matter of swapping the camera and re-patching the head-end from the VPS into a switch.
As for the company, I can say we always got amazing pricing and service from them... particularly from Annie at their west coast office. I'm almost a little sad that we're pretty much exclusively IP now for new installs and upgrades, because I don't get to chat with her any more. If they have the pricing you like, I'd say go ahead and deal with them with no concerns.
For our HIKvision and Dahua stuff, we get it from Nelly's Security out of Tulsa - I've "known" Sean since he first logged into CCTV Forum looking to sell a pallet full of used gear he got from some abandoned warehouse or something and started up Nelly's Surplus :) If we hadn't already been buying Dahua from him (under his "EYEsurv" label) when Eastern started carrying it, we'd probably be getting it from Eastern now, but Sean has also always provided outstanding pre- and post-sale service, and AFAIK is still very selective about the specific models he sells, testing them all before deciding to carry a particular line, so we've stayed loyal to him.
Overall, I'd recommend either one, based on my own experience.
