I also have a Dovo 5/8 from SRD. I purchased a few vintage blades that were 9/16 I think, and used them while I was getting some honing practice in. When I went back to the 5/8 the biggest thing I noticed was the weight of the 5/8 blade. Most vintage razors I've purchased seem noticeably lighter. Going back to the Dovo 5/8 took a slight bit more effort to control than the smaller vintage razors. The Dovo has a rounded spine, so that adds to the weight a bit as well. Not uncomfortable just different.