So far, so good. I bought this to fix communication issues with 10G fiber optic connections. I suspect there are many dirty fiber ports causing errors and link instability. When it arrived I immediately plugged in an MM fiber that I've had at home for years. I saw quite a bit of dirt and grime on the ports. For the first time I saw dirty plugs with my own eyes. Now I definitely believe in fiber cleaning. At work I connected the SM fiber and also saw dirt on the connectors. You can definitely…