Well good news for you, at least they are honnest!
To be fair, I think you're just unlucky. I use JBL since about two months and no problem at all.
Pretty sure Eheim is just as reliable, maybe just the odd one you add then.
Reagrds
They're a good bunch of lads and they always match internet prices too,I think they were pretty surprised that it was a genuine fault on the filter that they couldn't fix.