The leveldesign is very good and clean. Some specific structures are really impressive and original and the industrial sectors are just stunning.
The Hazardous Course by Richman is not just the hardest mod you will ever play (at least its the hardest one I know about), it also gets frustrating very soon, it is totally not fair, it will make you blame the Half-Life engine as the pure evil created by satan himself. Let me guess your first thought when you have quickloaded for the tenth time: “Is this a freaking joke?