Purchased a Voltshelf in dark grey for my 2017 Volt this past week. Arrived promptly via Fed Ex. Instructions are clear and installation is relatively simple. Two clips attached to "trunk" sidewalls hold the back of the shelf up and the front attaches to the rear headrests which must be removed to insert a string loop so the shelf essentially floats and will lift with the hatch opened for access. I noted a dampening of the subwoofer since the shelf creates an enclosure and can be compensated by increasing the gain of the sub. When carrying tall items you will need to detach the shelf which can be placed on the floor of the trunk. In order to detach the shelf you must remove the rear headrests which is cumbersome and can probably be jury rigged to avoid this problem. Although I found the product to be well made it is not a modification that I desire and have put it up for sale on the the forum under G-M Volt For Sale section.