At present, the new Duckoff is not very good and difficult to control. It is the most difficult metal flute head to control. Bickel is ok, but playing pop music and jazz is better. But now that the old bickel is gone, they are all new versions, which are said to be not as good as the old one. There are many fakes in bickel now, so you should look carefully when you buy them. Now all new products have anti-counterfeiting marks. Leibo is good, too. It is best to control and use it. As for the timbre, it's not bad. Others say it's useless. This is just a suggestion. It depends on what style and timbre you like. Recommend some of your masters, listen to their timbres, and then choose what timbres you want to buy. Not to mention the tenor Duckoff used by Kenneth, the old version of Miami D8, the alto Duckoff used by Kennedy Dave, the customized version of Bizel used by Dave Coates, and the alto Lebo used by Kobayashi Kaori.