I flew them two weeks ago. The flight was also delayed but so was my flight to AMS so I'm actually happy that happened.

I don't know about business class (which they had). I flew in row 6 (economy) and thought that the seat pitch was particularly bad. I am a 1.69m woman and never before had problems to cross my legs when sitting, except many years ago with XL Airways maybe. Here I couldn't cross my legs without stabbing my knees with the table in front. This translates into taller people and men in particular not fitting into their seats. The airline also used a remote stand in MAD (jet bridge in AMS at the very end of C) so we all had to wait for the busses to get to the terminal when arriving, which sucks when you land late at 1am.

Food service was regular KLM, but it felt a step down.