e46: Theoretically, that's true, leather needs to be conditioned from time to time and cleaned often to prevent cracking and discoloration (since it's an expensive invenstment, it's smart to do so). In terms of leatherette (I'll call it vinyl from now on), it's easier to maintain, but if the quality of the vinyl isn't suited for stretching upholstery use or if the surface is not snug in fit, it can deteriorate quite rapidly, especially around the seams.