What is the difference between the New Standard, New Improved, Bostonian, Richwood, etc.? Are the razors themselves the same and the difference is just the case and package it came in? I've seen a few lately and they look fantastic, and from the sounds of it, shave great as well. I'm thinking about picking one up and want to know exactly what I'm looking at and what I should be looking for. Thanks for any advice on these.