I have a variety of different heaters that I got off ebay. I'm not even sure they still make the ones I have but here they are:
Marineland stealth shatterproof 25 watt. It works well.
Marineland Neptune 25 watt heater. This one is Awsome. It's the only one that is spot on with the temp, but I dont think they make this one anymore.
50 watt submersible heater. The seller is in China but this heater is on USA voltage. It works fairly ok in a 10 gallon. Its set at 92F but the temp in the tank is about 76-78F.
Tetra preset heater. I got mine from Petco. IT SUCKS. I have seen the temp in my 5 gallon as low as 68 and never above 72 but its preset at 78.
I dont have the one you asked about, but I have been told that it can overheat a tank as it does not shut off if it gets too hot. If you are patient, try searching ebay every few days. Every now and then you can find a good deal on a heater without an outrageous shipping price.
ETA: most of my heaters are in 3 gallon kritter keepers, minus the 50 watt one in a 10 gallon tank.