Solid plyo boxes that do what they're supposed to. I've been using them for box jumps, step-ups, and plyo work and they've held up great. The stackable design is a space-saver and gives you a lot of height options. The one thing slight negative is that lining them up to stack can be a little fiddly, especially at the shorter heights. It's a minor gripe, but worth knowing if you're planning to swap heights frequently mid-workout.

Extremely well built piece of equipment. Expensive for sure, but the build quality is top notch. My biggest gripe is adjusting the height. Having to remove two mag pins while simultaneously holding the spotter arm in place for balance can be awkward. I usually end up putting one of the magpins in my pocket or on my bench somewhere while I move the spotter. Doesn't seem like it would be a big deal, but it's a big enough annoyance for me that I end up almost never moving them. Also there's a noticeable amount of play when fitting them on my REP PR-5000 rack. Not a dealbreaker, but not ideal for a product at this price point.