I just received these, so I have not run them. Carleton Palmer ordered them and used them for years in his racer. There is no problem with the ends according to Carleton. I don't know if the ends can be removed to shorten the rod. I ordered a few in different sizes to save me the work. Smith Brothers will copy the original in steel or aluminum if you wish. I always had a machinist make mine out of aluminum with no steel ends and never had an issue, but I like the idea of the steel ends as well as ordering the size I want. I have also never had a problem with the material growing in length for tappet adjustment. I checked clearances when hot and there was no problem, so I assumed the short length of the rod was the key.
I think these rods have no restrictions and you could run them in your street bike, but I am not sure that there is a problem to solve, unless you want a specific length that is not easily available from the Club. Carleton and I have gone to 8500 RPM a few times so, valve train weight can be important. Tim is right that it is nice to have a business dedicated to this. They have a lot of experience and they generally will stop you from doing something stupid like using the wrong materials.
David