I have an Eheim Pro 3e 2078 that I'm unhappy with after 13 months of ownership. I started having problems with it after the last filter cleanup (stuck in programming mode) and although while it's still filtering away, the added cost of buying the electronic filter is useless.
I've already tried contacting their customer support; all I could find was a contact us form on their site after 98% of the links on their site jump to nothing but 404 errors, but I have not heard a thing from them at this point. It's supposed to have a 3 year warranty, but with no way to properly contact them (I'm in Canada), and it not being possible to tear the system down to send back (if that's the case if I ever get to speak to them) because I cannot be without the filtration, I'm pretty much screwed.
Right now I have an amber light blinking waste of $400 - avoid the electronic models.