I just got a new bike the GSX650F and it has a shift light that I can set to what ever rpm I like. So once I figure out where on the 14000rpm gauge with red line at 12,500 ,then I'll set it to were I like. I can set it ....on or off ....or to blink or just come on and stay on till I change. Or come on slowly etc. Question is ,do you use it ? Is there pro's and con's of using it or even having it. Or is it just a gimmick? Thanks ,Sled.