Okay. The OP is asking for experience with amp power, so here’s one.
About 10 years ago, my "rig" was running an amp with just north of 100wpc. We serviced equipment full time, also providing performance upgrades. After "hot rodding" an amp with 600+wpc I decided to do a "field test" in my home. The speakers are of my own design, are approx 97db efficient and have "sufficient" cone area.
After a little warm up period and determining where to dial in the volume control on the preamp to get max power without clipping, I queued up one of my favorite demo pieces: Foreplay: Between the Sheets and got comfortable in my listening chair.
Those familiar with the cut understand that things happen pretty quickly, so I braced myself for the anticipated impact to follow. I pushed the "play" icon on the remote .... and ...
I felt the bass hit my chest. Not the first time this had happened, but not at this level of intensity. I then felt the bass go through my chest, hit the cushion behind me, which caused it to vibrate. If felt the recoil of the cushion hiting my back. It was startling to say the least.
The amp was returned to the owner (accompanied by a big "thumbs up"). I’ve never had an experience even close to this in my home. The additional 8db (+/-) of headroom was clearly "audible." You may be asking why I haven’t purchased an amp to duplicate this experience in my home? I have hot rods in my garage. Doing a smoky burnout once in my lifetime is enough.