CCTV4ME

What are your views on a Milestone Xprotect Enterprise Edition.. 1) is it really ideal for large corprate sites? 2)What sites have you seen it in operation? 3)Is it very versitile, and compatible with verious systems? 4)If you rated it out of 10 what would you rate it? 5)are you a systems engineer or operator? If you could answer these for me that would be wonderful.. Does anyone know what main cctv system heathrow uses ?