Let me start by saying these rubber vibration isolators are *solid*. Like, 'lift-your-AC-unit-with-confidence' solid. I installed them under my 24k BTU mini-split condenser, and the difference in vibration noise was noticeable immediately – it went from sounding like a distant lawnmower to a gentle hum.

The anchoring system is clever – you drill, insert, and as you tighten the bolt, the anchor bulges inside the hole for a rock-solid grip. Though fair warning: if you're using power tools to tighten, ease up! The rubber compresses easily, and over-tightening can make your unit tilt like a tipsy penguin.

Two quirks worth mentioning: First, the included bolts rust faster than a tin roof in monsoon season. Swap them for stainless steel if you can. Second, these pads add about 2 inches of height – great for drainage but might require adjustments for tight spaces.

Surprise MVP feature? During a freak windstorm, my unbolted (oops) condenser didn't budge – the combination of unit weight and these grippy pads saved my investment. Just maybe bolt yours down properly unlike me.

Final verdict? For $20-ish, they outperform flimsy OEM pads dramatically. Not perfect (hello, rust-prone hardware), but for killing vibrations that travel through walls? Worth every penny.