The product is very solid (~7kg the tube + 6 kg metal stand). It is big, easily accomodate anyone up to 1m90 (~8.4feet?).
Raising the trumpet and putting it in the tube requires some time to get used to. If your playing angle is low (downward, >15 degree), putting it in the tube is very simple. If you play with bell horizontal, you actually need to raise the trumpet then step toward the tube to put in. No way I will play it while sitting (even if the promotional video suggested you can) unless you want serious shoulder pain.
It is quite restrictive in movement, so I would not recommend it if you pivot a lot, or play live as a mic holder.
As you may guess, there is no resistant in blowing. But being restrictive in movement may cause additional tension in playing at first. After 1hr of testing, I think I got used to it.
Sound/Volune: The volume is between a Harmon mute and Straight mute. It is not for night practicing. Your roommate/mate will still hear it from the next room. However, by cutting off the upper frequency, it actually makes the sound very mellow and much more bearable for others. As you put the trumpet deeper into the tube, the sound is stuffier but not quieter. From the player perspective, I can judge my sound and tell/feel when I overblow or when the sound is airy.
The music board: I think a tablet is best used here. A4 music sheets may be slightly too big. It is quite close to the face if you put the bell deep into the tube.
Overall, I am happy with the product for my situation (semi-tolerant neighbor and baby) and will keep it.
I definitely don't see it live (as gimmick maaaybe), night practice or traveling. People playing with horizontal trumpet angle may find it harder to get used to.