I had the same experience with my Millrite. I had a 4" vise on it to begin with and came across a deal on a 6" Kurt. I was worried that it would be too big. But after mounting it, all was fine. It had a little hang over in the back when mounted in the middle position of the table, but not significantly more than the 4" it replaced. I have had the 6" Kurt for about 9 years and have never wanted to put the smaller vise back on. I have purchased a lot of accessories that didn't seem available for the smaller vises or at least are much more available such as soft jaws, rubber faced jaws, oversized tall jaws, parabolic jaws for round stock, etc that have been very useful. Additionally things like stops and parallels are cheaper and easier to find. Considering that a 4" or 5" used Kurt cost more than a new 6", I wouldn't consider the smaller vise unless I had a mill with a table smaller than say 8" x 28". But that size on up 6" all the way for me.