I don't use many heaters nowadays, but when I did I was also fan of Jagers. But, sadly, while browsing the website of one of my favourite Canadian aquarium/pond suppliers (Pets & Ponds), who carry numerous lines and brands of heaters, I found this interesting disclaimer on the Jager page:
"Despite their former reputation for a quality product Jager heaters are now the most unreliable heater we offer. Jager heaters are prone to highly irregular temperature fluctuations."
Sounds as though Jager has followed in the footsteps of countless other once-trusted brands; i.e. establish a reputation for building a quality product, then begin to rely upon that reputation while cheapening the quality to increase profits. Very sad.