I have some experience of the HDS16 system.
I'm thoroughly unimpressed by it. We have it in our big music & drama studio, wired into the building etc. The centronics connector is not suited to this application. It was designed for plugging your printer in and never moving it. They are particularly not suited to having the heavy cable that comes with the furman leads hanging from them.
The other thing is that the artiste boxes seem a bit lightweight and don't feel particularly robust, another feature of them is they come with a lot of sharp corners.
The base unit (for want of a better term) appears to be fairly well made, only thing I don't like is the sockets are on the front rather than the back.
I also have a vague recollection of the HDS6 being fairly similar.
There is talk somewhere else of someone doing a DIY kinda solution to this. I can't remember exactly where I saw it but it's fairly recent.
I'd avoid Furman's headphone systems if at all possible.
Roland do have a digital one based around their REAC digital snake thing...I've not seen it, but I've spoken to some studio engineers who have had a play and they seem very impressed by them. Thing is your wallet will take a serious hit!!!