Wifi Extenders

[Norty]

I am looking at buying a WiFi extender but not sure on a few things.  Has anyone tried one, I am looking at getting one with an either net connector to connect directly into my Devialet.  

1. There is the type that gets the connection via the electrical wires in the house, does this cause an issue with SQ.
   
2. Has anyone had good results with any particular unit, looking to spend + / - $100 Canadian
   
3. is there an advantage of connecting to the extender if the extender is only 2 feet away from the Devialet
   
4. I believe that extenders does increase latency is that a big issue
   
5. anything else you believe would be pertinent would be appreciated.