questions about yamalink

Hi guys I am pretty new and have a lot of question but I guess I have to put each in each category.

What do you guys think about the yamalink?, what are the advantages of lowering?. I am 5'9 and bike fits just fine in stock config but I read in a store that the yamalink improves handling no matter how tall rider is.

Save your money and use the ride height adjuster on the bottom of the shock to lower the bike up to .09 of an inch.

I prefer the way the bike handles with the rear lowered .9 of an inch and the front at stock height.
The stock setting always felt too high in the rear and the front felt heavy, commonly called a stink bug stance.
With the rear lowered the bike feels more balanced front to rear for me and the front end still sticks great in any type of corner, which can be an issue if you lower the rear and not the front on most bikes.

edit I just clued in your on a X, not sure if this still aplys to them, im an off road guy on a R.

At 5'9" the stock lowering should be sufficient on the X unless you are all torso. My wife at 5'4" needed the yamalink as well to flatfoot comfortably. With the link, stock lowering in the rear, dropping the front one inch, and a low seat, her X seat height is over 4 inches lower than mine fully raised.