I've built a few homemade volumes from plywoods scraps, but this volume is far and away the best in my collection. Sturdy, aesthetically pleasing, and worth the price.
There is enough spacing between the t-nuts on each face to accommodate multiple holds. Helps create great underclings on both vertical and overhanging walls. Haven't had any issues with the volume spinning even without the set screws, which is a plus.