bugger aye, just as well i got my Elka 5 for 1/2 price then !!I have the precission.
Easy to install, great and easy adjustment, and you don't know it is there while you are riding.
6 months on it with no problems.
Put it on a mates bike that has the Elka. He was so impressed he has ordered a precission as well.
The GPR has a very good reputation with the two wheel guys, but I can't comment as I have not tried one.