I'll third filterguys, Jim is great ! Awesome prices on replacement sleeves as well.
Heaters? I have a couple of stealth 250 watt and a couple of visitherm 250's as well, I like the stealth's protective sleeve and auto shutoff feature,
I also have a 300 watt Azoo titanium with controller for my 50 gal reservoir. This works well too, and keeps a very consistent temp with what I set it at on the controller, as well as auto shutoff if overheating.
I use a Hagen digital checktemp pocket termometer to make sure my temp is where I want it, not too sure how accurate it is in water, but I had to try it on myself......of course.....I scored a 98.5. So I'm guessing it's pretty accurate.
I've used Ebo's in the past on different set ups and they work well, and are very consistent. But they are glass
So I guess I would rank them this way
1) any type of titanium
2) Stealth heaters
3) glass, whatever brand...