Just had the second one (150W) die on me. The 300W in my 60G died about three months ago after only running for four months. I though that maybe the first one crapping out was a fluke, so I bought the 150 for my 20L. Apparently what they say about chinese made equipment is true.
Get the Stealth heater. Many people have them and will not get anything else. I've never heard of anyone having a problem with the Stealth. The price is very reasonable. I took an online Petsmart ad to my local Petsmart and they honored the online price. Price and quality can't be beat. The Doctor.