looking to purchase an OwlTech camera system. Any reviews?

Here's a link to the system I'm looking to purchase ( on eBay) :

http://www.ebay.com/itm/151889667805?euid=6700da580f7a4d9693b2a476aee370f4&cp=1

It's an Owltech 8CH 5MP 1080p NVR with 4 cameras. The 8 camera system is $999

Is it a good value for this system and does anyone have any experience/knowledge about it?

I looked for reviews online but couldn't find any

Or for those who know about cameras if you can please give me your opinion

I would really appreciate it

Thank you so much!

also am I going to be able to substitute one of the cameras for a PTZ camera?

I did not know OwlTech sold to end users. We use they in "cost effective" installations. The warranty is only one year. You get what you pay for. So far, no issues. We have installed about 16 cameras, all 4 camera installations for home use. I would not install these in a commercial setting. Tech support is good.