Like all cubes, how the GuHong reacts to corner cutting, popping, and "stability" is directly affected by your tension. The GuHong can allow for a loose tension and not pop that much, and it can have a semi tight tension and still cut corners pretty well. I think tensioning a GuHong is probably easier than tensioning the other "fast cubes" whereas probably a bit more difficult than the smooth cubes (F series (including GH)). The GuHong doesn't lock up much at all, but it doesn't have the same "smooth" feeling of the F series cubes. I much prefer practicing with my GuHong, for the simple fact I have it on a pretty loose setting and it will force me to become more stable. I might use my FII for competition still, but right now my GuHong is a great cube to use.
FYI: The GuHong cores commonly have one hole in them that is too small and won't allow you to put the screw in. I suggest using a sharp knife to fix this issue. Insert the tip of the blade to where it's just spanning the diameter of the hole, then slowly (with a very little amount of pressure) spin the core around the blade (or spin the blade inside the core). Do so carefully, just enough to shave just enough plastic away to get your screw started, you don't need it after that.
Just don't be like jms_gears and put a screw in slanted!
To all for you questioning Andrew's lunch: It kind of depends where he ate lunch at...