I just wanted to post my experiences with other brands, in case some here have been a bit too faithful for the stealth (btw I know a lot of reef folks who swear by these, but have them on a controller so if they get carried away the controller becomes the thermostat).
I have used Ebo Jager which is by far the best heater I've ever used, once dialed in (mine didn't have a temp on the thermostat, this was years ago).
Penn Plax non-submersible, good old style heaters, very hard to pin down, but once you do, they are decent for sure.
Penn Plax newer style submersible. I have one of these in every tank of mine because my closest LFS sells them and they are very inexpensive. The temp setting on these isn't what it says on the heater, so you have to fuddle with them (I personally don't trust the temp setting on any heater, except maybe digital ones). I have a 150 watt in my 20 high (it's 100% uncovered), 250 watt in my 56, 50 watt in a 5 gallon, and a 100 watt in my 75 (plus 20-25 gallon sump).
I also have a fluval 300 or 400w (don't remember) in the 75 gallon, it performs most heating duty - set to maintain 80 and does so. The 100w penn plax is set where it would maintain 79 in a smaller tank. If the fluval failed it would probably run 24/7 and keep the water at least 76 or so, so it's a safety net.
I use Jagers and usually nothing but jagers. Never had one go out on me, never had one stick for me and they are durable. The light shows me when they are on and they are pretty dang accurate. Its my go to brand.
I used to be a stealth fan, then I had a few go out on me not even 2 weeks out of the box. And a couple stuck on and cooked a tank. Never again.
I do use 2 Hydor inline heaters on my showtank. I'm very very very impressed by these, and if I have a canister won't use any other heater but these. They are great.
KeithAtFintastic wrote just to clarify, "Eheiim" and "ebo jager" are the same heater.
Thanks for clarifying that, Keith. I do have the ebo jager heaters, but thought they were manufactured by eheim. Like others said, I really like them. Now I've just got to gather up all of my spare heaters and make sure I have enough to heat tanks while I wait for replacements. I really do have a boatload of the stealth heaters. :cry:
Two, With the Visithermsthe higher wattages give me more trouble with them going out. I have had one 300 watt replace three times so far this past winter and the fourth is lying on my desk not working now. These used to be the best things available, but not so sure now.