We have heated floors throughout the house, but they are heated by water tubes under the sub-floor that circulate through our propane furnace. It is the only heat we have besides a wood stove, and it works great! I can't comment on the efficiency of the electric system you linked to, other than the fact that turning electricity into heat is probably the most inefficient use of electricity.

As far as installing tile over a wire mesh, I'd say it's difficult enough just installing tile without having to deal with the unevenness of the mesh addition. I've installed thousands of square feet of tile over the years, but have never done it over a heated electric mesh.

Good luck.