I brought these stands to use with some lights, which unfortunately were cancelled by thomann.
The stands themselves are great, and would have been the perfect height for these lights, but unfortunately for mounting things like a par bar, which I'd have liked to do, they aren't quite tall enough for this purpose. However, I've been using them with speakers and also to pole mount a TV and LED battens, and have found them to be really great for this sort of thing.
These stands would be great for speakers of almost all sizes, although I expect perhaps a 15 inch cabinet to be a little too large for these stands. For speakers their range of heights is pretty much perfect, and would definitely be a really great, cleaner and safer alternative to a traditional speaker stand.
The construction is very solid, with a sturdy base, metal and strong plastic construction, a really solid screw in pole and metal pin. Using the stand is very simple, just two parts which screw together and you're set to go.
The base is heavy, but that's a good thing, it's reassuring to know that there's a decent weight holding your speaker down to the floor! It may benefit getting a bag for the base as it's a bit slippery to carry, but all in all a well thought out and stable stand for a variety of uses.