This generally will only work for well-insulated spaces as getting enough heat starts to end up costing and there's the risk of overheating the surface. If you can meet the needed load without overheating things, then it's viable, but potentially, at least in many places, a very expensive way to go. Electic costs in many places are multiples higher than NG, but if you're lucky to be in an area with an excess of cheap hydro power it becomes cost effective. Often, this is only used to take the chill off the tile, and to add a little heat as a secondary source. Finding a location where it works as primary heat is less frequent.
One thing to help in this situation is maybe a heated towel bar.