Thought I'd give these bad boys a go as I always like trying new blades. For me personally, I found the Sharks to be sharp enough but not especially smooth. Having said that, I achieved a reasonable shave and will keep them on hand for an emergency.
These Shark blades are pretty good IMHO. They are reasonably sharp, very smooth and I can get 3 - 4 nice shaves per blade. The plastic case has a used blade slot, which is useful and who could resist the uber cool shark logo. 8)