I don't know how many times I use the long rail, then short rail, then long rail, etc. I can't imagine having to spend more time dealing with the rail than cutting. The 55" is a very useful size by itself - the most useful for me. A longer rail is a nice compliment. If cost is an issue, you can always start and stop your cut and reposition the rail. I have two long rails and bought a 32" when I needed some retail therapy, but I rarely use it. For me, a 75" would get used more than a 32", but I wouldn't want to be without an 8 or 9 ft (capacity) rail. A lot of smaller pieces end up being cut on my cabinet saw.