I bought a 2007 Kawasaki Nina 250R a few years back, replaced a single part on the suggestion of the seller, and rode it without getting anything changed on it, including oil, for about four years. Call me an idiot or call me lazy. It was in bad shape and was having trouble starting last week so I finally took it in.
The sound it made after Those Guys worked on it... I've literally never heard it sound so perfect. It has never rode this smoothly as long as I've owned it. I had no idea it was supposed to be this nice. Those Guys has blown my mind.
The shop isn't pretty, and honestly that was my first sign that I was in the right place. These guys get their hands dirty to get your bike cleaned up, and they do it for a great price.
I highly recommend them. Can't recommend them enough, honestly.