Well, we've been using WiFi on my PC for the last several years because where our computer is doesn't really work to run a Cat5 cable (well, wife doesn't want it running across the house as she runs a dayhome). So I purchased a Powerline Adaptor for super fast internet (which works!). I guess that will be my birthday/sobriety gift for myself lol.
There's really no speed difference between having it plugged into the modem as opposed to using the powerline adaptor.. I love this thing.