I hate to burst the bubble, but this will probably not be very useful for espionage and spying.
I read briefly the articles, and there was a good editorial on the items in question. Apparently, it's thought that within 5 years the devices would be available for radio waves, but it is going to be difficult to characterize a material for broadband light. Apparently these materials will work for narrow bandwidth light fairly easily, but there is a lot more materials engineering to make it broadband. Add to that the fact that the refractive indicies of the material must change as the cloak moves, it becomes more difficult to make a dyanmic (and thus acs's cheerleader observation system) cloak. SO, to actually have an invisibility cloak is much much farther away, if it is even possible.
In addition, the editorial states that these will not be very good for spying for a couple of reasons: Naturally, people can't see you in them, but since the light is being bent around you, you can't see out
Moreover, you wouldn't know where you put your always-invisible cloak when you go to the bathroom (much less where the bathroom is). (Ok, I added that last part about the toilet)