The shavette or feather blades are very sharp. You can shave with them in a straight razor like appliance but you just need to be very careful about the pressure in particular.
I got much better at straight shaving by being able to compare the shaves from my Feather Artist Club and my str8s. I still use both a Feather Artist Club str8 razor and a Japanese style Feather razor in my rotation. I enjoy them very much. However, there is nothing like some of my traditional straights. There is something special about maintaining the blade that you shave with every day.