The Prime Stability Pad is one of my most used rack attachments. As advertised, it improves stability on a variety of exercises, increasing control for rows, presses, flies, and a variety of other accessory movements.
The stock design of this unit would be adequate for most users, but benefits from some small modifications. One is the guide/limiter pin. By removing this, you can store the unit vertically when mounted to a crossmember, as I've done. The second modification I made was swapping out the stock green pop pins for the JD Gym Equipped 'Green Delete' knurled pins. This is a strictly aesthetic modification, but is a huge visual improvement over the default green plastic pins.
Modifications aside, there are some other qualities that leave much to be desired. The first is the tolerance on true 3x3" uprights or crossmembers. The unit tends to shift and move under significant load, which causes friction against the rack, undesired play during the movement, and creates an audible squeak with each rep. The second, and arguably worst quality is the pad. I'm not a fan of Prime's padding or slippery vinyl, but that's not my complaint. What really bothers me is the pad's back plate. It runs in a narrow strip down the middle of the pad, and will inevitably pull off the plywood backing, while straining the stitching - especially if load is unevenly distributed across the pad, which is inevitably the case with some movements.
Storage is another shortfalls, as it's quite large, oddly shaped, and relatively heavy. Instead of storing the unit off of my rack, I've permanently mounted it to a retrofitted crossmember on my Stall bars.
Overall, the product performs well, and I was very close to rating it 4 stars in the category. As much as I want to love the product, these small design deficiencies leave much to be desired. It's only a matter of time until a competitor develops a much better version of this product.
Performance
Value
Build Quality