The Yamaha 8310z flugel is a dream to blow with good intonation and lovely sound, although not with the supplied mouthpiece. I use a wick 4fl.
Valves work really well but need much more lubricating than I'm used to. Build is quite light and you have to be careful not to dent .
The water key rubbers appeared to shrink after just over a year and the main one leaked badly and all of them started dropping out, it looks like they were not glued. However thormann replaced the main one and sent a spring with no quibble of which I am most grateful.
Overall I absolutely love the instrument and it has made playing a pleasure. I would highly recommend them.