Short Review.. Pieces of fertilizer, do not buy..
Pro: cheap adjustable heater & holds the temps fine.
Cons: Like to blow themselves up & shatter inside of tanks..
I have had a 100w & a 300w of these heaters. 1st the 300w ate fertilizer when I forgot to unplug it during a water change.. Wasn't going to hold that against the brand as a whole since that was me being dumb even though it shouldn't have shattered itself from only being half submerged.. Well tonight the 100w bit the dust. My family & I were int he living room talking when we notice a strange hissing sound. My mom looks at my betta condo's & says its there filter.. I look & there are bubbles coming out of the heater which was below the filter. I look close & I can see that its full of moisture. I managed to get it unplugged just in time for the freekin thing to explode & blow its end & shard of glass into the tank..
In the future I will be sticking to Jager heaters.. The elites though cheaper are not worth the risk.