All of the major bit manufacturers have them and refer to them with the designation RC for replaceable carbide. If the replaceable blades are square, for example a 12mm x 12mm then the blade will be able to be turned 4 times to expose a new cutting edge. If it is rectangular it will be 2 times. If it is a profile pattern like a roundover only once.
They can be very cost effective if it is a bit you will use a lot like a trim bit or maybe a chamfer. One member suggested that the carbide on those blades is harder than the ones that are brazed onto regular bits, possibly because they don't get heated up.
Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.