Like most 12-South products, this looks the part of a proper Apple accessory and is well constructed. However, I was a little disappointed that once installed it seemed a little flimsy. I bought the backpack to be a HDD holder on the back of my iMac 27". It installed OK, but the clips that attach the unit to the base of iMac pedestal are not tight enough. I had to shim them with a little piece of plastic to make a snug fit. YMMV.
I purchased this item some three years ago and installed it for additional storage capacity on the rear of my 27" iMac. I have not moved it about since installation and it has proven very unobtrusive and useful in keeping my desk organized in a very small space. I have used it to store a weather station monitor and hub for a peripheral device without problems. If you feel it is expensive, it is very worth the outlay as you will get years out of it, it can be taken to a future Mac and it will help with your aesthetic.