Read up on how they work
In short, no, they're not like blackholes.
The principle behind them is that emmissons heading into the cloak are routed around the object and then leave, and here's the clever bit, in a direction and intensity equal to what would happen if the invisible object wasn't there.
A drawback of this is, if you were building your cloak on the observable spectrum, if your inside the cloak you can't see anything outside of it (as all the incoming light gets diverted around you)! Admittedly it's only a draw back if looking around you is important, there's good reasons not to care and cool applications e.g. building a sea platform that is invisible to incoming waves (google it, my brain hurts from remembering so much already)
Source: http://rss.slashdot.org/~r/Slashdot/slashdotScience/~3/Ol7WDcXiNvs/story01.htm
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