I have used both electric and gas powered edgers in the past.  I prefer the gas ones since you don't have to drag a cord behind you.  The electrics never seemed to have enough power, either.  However, this unit is different.  Seems to have plenty of power and really isn't bad to use.  You still have a cord, but the handle design keeps it out of your way and behind you.  Very reliable and does a good job edging.  The first pass took a while since there was a lot of stuff that needed cutting.  After that, subsequent trimming is very quick and easy.  Glad I purchased this.