Build Quality:
The product is well made, the packaging is good and it is easy to set up, though as with most drum wrack gear it won't be coming with instructions, so it should be self explanatory to you anyways.
What I found was that whilst it is sturdy it really was not stable for use with expensive electronic equipment that has any weight in it, because you will need to purchase some memory locks to stop it slipping forward or backwards on a rack or stand (unless you have some correctly sized spare ones- which most drummers do).
Extra memory locks are not that expensive at all, but for laptop or drum module/sequencer product mounting- locks will not be an optional extra-as with all these things it will be common sense to the drummer / percussionist but to someone using it for keyboards or DJ work, or simply the unacquainted: it will be helpful to know that beforehand.
Stability:
Once set up with memory locks it is invaluable, sturdy and finally, stable and will pay for itself over and over. It has stood numerous gigs, and some pretty tough treatment without failure or damage to equipment, and as the positioning screws are moveable it is flexible for so many settings from studio, practice, gigging or touring. Gibraltar have made this item well - I recommend it.
Cons:
Quite large arms for small settings or cramped spaces-otherwise brilliant.