I am pretty sure most people reading this are already aware of what Jaspers means: Prices are high, but for that you do trust it to hold up tenfolds in value.
As another commenter pointed out however I would have really loved for there to be a manual to be fully sure that you're doing it correctly.
The pictures kind of point you in the right direction, but it shouldn't be too hard to include a 3 step guide. Instead you get a picture guide on how to insert the screw threads into the guide rails - which at least for me was not only not helpful but actively detrimental (trying to insert them as pictured didn't work and damaged some of the tension arms. I got the best result by just sliding them in from the top. At least they provided two spare ones).
After figuring out the construction I stumbled into the next mishap: the included clamp to fasten it onto the leg of the existing stand has two bolts on it instead of just one. It is probably just for more stability and because that is the usual replacement parts. This though leads to the two rails being uneven on height, as the right (pre installed) rail sits lower due to the connector clamp having the screw only on the outside while the left rail has to be higher due to the screw on the connector piece.
As far as I can tell it does not limit functionality too much but it still seems like an oversight that could have been remedied.
My last little gripe is that for that price I would have hoped that they would include an option to lengthen the right tube into a foot piece. As it is it's rather sturdy but having only 2 points of connection still makes the construction more flimsy than I would like it to be. Having the option to install a 3rd point of contact, in this case to the ground, would make loading the rack with heavy patch bays and effects more enjoyable.
All in all it is a Jaspers - you don't want to spend that much money on it but it's probably worth it in the end.