Peter from Arakawa here. I hope it's OK to make some technical suggestions here. I've contacted this poster off list as well, but we recognize and can alleviate some of the issues mentioned here. I'm not comfortable posting commercial issues, but want to make sure that the technical benefits and limitations of the Arakawa Hanging System (and by association, cable systems in general) are known and understood.
The nature of a cable hanging system is to support "gallery style" viewing, which will have art angling slightly away from the wall. This angle depends upon several factors, most of which can be controlled by where the cable attaches to the frame.
Art being knocked askew can be resolved by hanging framed art from two points at the back of the frame. This does require more hardware, so will increase your cost.
The twisting comes from stacking art on a single cable, in which case the bottom frame pulls the cable away from the wall, and prevents the bottom of the top frame from sitting flat on the wall (that's some tortured English). This can also be resolved with a two cable suspension. A rod system (such as Walker) is rigid, so it won't twist or blow in the wind, so it will resolve this, but it is more visible.
The slamming doors... can't do anything about that, unless you want to go to a system that uses both a top and a bottom rail. Again, increased cost.
I hope that helps. If you have suggestions or are interested in ours, please let me know.
Thanks,
Peter Gutmann
President
Arakawa Hanging Systems USA, Inc.
The previous owner of this shop had a wire system put in (not sure if it's Arakawa but it's similiar) and I can't stand the way the pictures hang. Sometimes they pull away from the wall and then the picture twists to the side until it makes contact with the wall. They look crooked all the time even if they're not and they're very easy to knock askew (or off the wall completely). If the pictures will be within reach of customers or on walls with doors that slam open and closed, I would not recommend a wire system.
just my 2 cents