I have always found it a right pain to align the chain on my single-sided swing arm. Now I have help as I can buy this simple tool. Not quite sure how to do the alignment though.....
I do own this tool for my other bikes. I'm certain that I never paid anything like that for it! Dunno who BrookBarn are but that looks a bit strong! Nice to see that eBay is still the wild west though!
That would look good at night if you just leave it on and go for a ride. In a "sharks with frikken laser beams" kinda way.