Have had the displeasure of being with Vodafone Kabel DE for over 2 years - I have the 1000mb line, of which 650mb is the highest I have ever had. I track the speed regularly and its shocking. What's worse though is the outages that they have. Last week 2 full outages with zero internet and today the whole morning so far and still no internet (13h30 now). The last time I called them the operator was so rude, he hung up on me after telling me that I don't have a business contract and it's not his problem that I have to work from home during covid. He also refused to of course give me his name.
I would urge anyone thinking of signing up with them to look for other providers.