I received a set of these Corona bp3640 clippers as a present and did not think they looked that useful UNTIL I used them. They are great clippers. I have retired my old Crafstman bypass clippers and use only these. Their design makes them very easy and comfortable to use. The "return spring" that usually gives up on other clippers is still perfect.
Also, they are extremely tough (I use them for cutting almost anything I can get them around), and they have stayed sharp, despite the way I have abused them. I'm getting a few sets for my friends for Christmas and another set for myself in case I misplace mine.