I have been a long time user of Ebo Jager heaters. Tried VisiTherm and didn't have much praise for them. After 15 or more years with Ebo Jager, I decided to switch to Won Pro Heaters in my four tanks. I use the less expensive Pro Heat in the two tanks that utilizes sumps, (already have Time & Temp sensors in the main tanks) and Pro Heat II with the digital controllers in the other two tanks that have no sumps.
Very happy with them. No more tearing up the sump to play with the temperature dial on the Ebo's if I need to change temp, no more banging 22" glass heaters against tank walls, live rock when I need to adjust the temperature for the Ebo's in the main tanks.
Temperature stability has greatly improved due to oversizing the heater wattages too.