I like them, but don't have a ton of experience. They are pretty sharp and very smooth. Hands down my favorites, but I haven't tried sharks or feathers. I like them better than Bolaznos though
The Meds are my current favorite. That said, I've never used a Feather, and I don't doubt that it's sharper -- maybe the reason I've never used one ... I find the Meds as sharp as Iridiums and Yellow Gillettes, sharper than Red IPs but just as comfortable and longer lasting, too. I generally don't push a blade past three uses, and sometimes that's too much. I've had a half-dozen good shaves from a Personna Med ...
For me? Meds are not near as sharp as Feathers but they are way smoother. A Med blade will last me 4 - 5 shaves where a Feather will only last me for one. Meds FTW