I bought one of these flugelhorns and had to send it back as the intonation was so bad it was unplayable. I gave it a 1/5 rating. Luckily, Thomann's customer service was great and they refunded the money in full.
I thought it just might be a quality control problem so I ordered the same model again and this time struck gold (well, brass). This one has much better intonation - it's not perfect, the high D is always a bit flat, but it's way better than the previous one and is now fun to play. The sound as a whole is also better with this one, especially when playing quietly.
So, I've changed my review... from 1/5 to 4/5 - now very happy with this instrument at this price and think I will have to spend over ¤1000 to get anything significantly better.
Thanks, too, to Thomann's excellent customer service - by taking the old one back and refunding me, it allowed me to order again and get one which I'm happy with. Danke.