Nothing like it in the price range.
I'm just getting started with poe devices, and wanted something small and cheap that i could use to test a couple of used poe switches other than my expensive ip camera. If i were a professional installer, i'd buy something like the byte brothers poe1000il, but for <$25, being able to plug in the powerdsine poe tester and have it negotiate with the poe switch, and then light up to show that the switch was indeed providing 802.3af power made me a lot more comfortable with plugging in the camera. I wish that the device had a pair of recessed contacts that i could use to read the voltage using my volt meter. In my opinion, the addition of that feature would make this a 5-star device at this price point.