This is a quite nifty little thing. You can store it in the bell of the trombone and it can be unfolded in a very short time.
I see two problems with the stand, one being that it weighs enough to alter the weight distribution of the trombone, making it more difficult to carry the 'bone arond with you in its bag. This might actually only be a problem when you use it together with the 600 gram pbone, as I do.
The other problem is, that the telescopic mechanism is really weird. If you make a mistake when unfolding the stand, it will not be stable. If you ddo it properly, it's quite ok, though I won't use it for my bigger 'bones.
All in all it does its job, but no bells and whistles for this one.