Just received this trumpet which seems to be extremely well built, with a very full and big sound, but this is only for those who want this kind of tone !
I don't know why, but I couldn't get all the info I've requested from Thomann prior ordering this trumpet, then I could have avoided to buy it and send it back, just because it's not the sound that I was looking for.
I need to say that these trumpets are excellent for those looking for a big tone, with enough core, very free blowing and responsive, with an easy upper register.
Thomann does not share all technical details of their trumpets ( bell taper, bell thickness, overall weight etc - this should be an improvement action for Thomann in the future, as their trumpets/instruments are NOT that popular as many other well known brands/models ), so I had to find out by myself.
TR-4000S has a heavyweight and a large bell ( similar to Bach 72 taper), producing a very full and big sound, very resonant, that it doesn't break if it's pushed. Upper register is easy enough, probably due to it's reversed lead pipe, but it needs more air to get the best of it :) Overall, the trumpet is very well built, with a very nice finish, very good valves from the first touch (no sticky valves, very smooth action). It feels solid in your hands, well balanced...just as any other professional trumpet on the market.
If I would have known these aspects before, I wouldn't have ordered it, and not because it is not a very good trumpet, because it really is, but not for me !
Later edit : I've decided to keep it and give it a chance - if you can get used with it, learn how to play and control it, it might be one of the best trumpets in the world for the money.