Pablo,
I will tell you two reasons I can think of for using an electric grill.
1. You live somewhere that open flame (gas/charcoal/pellet) grills are not allowed such as a condo association or apartment that does not allow them.
2. Pure convenience. If you don't want to deal with propane tanks or charcoal or pellets and you just want to turn it on and cook.
I have cooked extensively on all the gas Q grills. I would prefer them in all instances to the electric Q which I have also cooked on a lot. I had one to use for camping since I could simply plug it into campground power for free and have to lug the propane tanks with me.
The electric Q's take longer to heat up although they will get quite hot. But once you open them up, they shed heat quick and take a long time to heat back up.
$50 is a good deal if the grill is in good shape.
I have a Q1400 flipper for sale right now:
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