My Bulbophyllum biflorum just bloomed (
Link to the thread), and about the smell; it definitely has one... for the first few seconds it smelled fine, like a watermelon, but then after a while... oh boy, it made me nauseous when taking pics of it. My nose was about 10cm away from the flower when taking the pics. The fact that it flowers with 2 flowers at a time probably amplifies the smell a bit, heh...
So, definitely has a scent, and it's definitely strong, strong as in it gives that "punch" to your sense of smell, not strong as in it will fill up a whole room.