I have recently become interested in getting an open comb. Instead of buying new I've decided to go vintage. I was wondering about the shave quality and characteristics of the Old Type. I have read up in the review section and tried to search in safety razors but most of my results were about restoration and the reviews left me with more questions. I saw in the reviews some discussion on shims, is that necessary for use with modern blades? In what way does that affect the shave? How would they compare to other open combs? Any advise from those who use these razors will be greatly appreciated.