I'm a big fan of the Catalina 50 watt heaters. I've got several of them running and never had a problem. But I like this little UP heater, nice and small and adjustable. Only down side is the voltage converter but once you have it, its done. Let us know how it works after you get it all hooked up. Also how much did you have to spend for the heater and converter?
With the popularity of Nano tanks I'd still like to see a company come out with a 2-3 inch, small diameter, externally adjustable, nano heater. It really can be that hard to produce just shrink the existing technology.