Just finished playing through this, and it's really something else. The open layout made it feel like I was playing a horror-drenched version of Lost Civilisation, and the atmosphere was incredible. With the exception of maybe Countrycide, this is the only wad that's actually made me feel a bit afraid. The reveal at the end is the stuff of nightmares, though you can avoid the cyberdemons almost entirely once you know what you're doing (on HMP at least, haven't tried UV yet).