Edimax Mini N300 Universal Range Extender

We have used two of these. They both worked. One was replaced due to installation tech laziness, but the other one is still chugging along just fine, two or three years later. Sometimes when I’m connected to it, I wonder if it (or the additional step of transmission to the router) is the reason I have some connection timeouts, but have never really been able to prove the cause.
It gets my wifi to work about 130 feet into my back yard, whereas the router located in the front of my house barely makes it out there at all.