just switched mine to EHeim-Jager, no longer EBO jager.. but same heater. Just made by german company Eheim. As we all know Eheim as a manufacturer has an excellent reputation.
I tried hydor theo's and they heat the water up too much before they cut off. They might be accurate, but they have a large range before turning off. Had set to 77, tank got to 79, and i had to turn the thermostat down to 71 for to turn off.
EHeim jager are listed as +/- 1/2 degree on/off. I don't care how accurate it is as long as its stable.
So far since switching, tank has stayed the 77degrees according to the temp controller and the reefanatic temp monitor.
you can't beat sam @ aquabuys.com for them. and you can get them NOW. If drive to Lawrenceville.
http://www.aquabuys.com Online price very competitive with other Internet sellers. And great guy to deal with.
I wouldn't trust any other petco/petsmart heaters in my tank again.