I received my Rock Steady Belt this afternoon.
It fits very well in the middle hole with no pistol and is comfortable with Wrangler jeans support/ tightness. With an IWB plastic holster and my Sig 239, the middle hole is fairly tight. Moving out one hole is comfortable. It might vary with what I'm wearing at the time. The belt doesn't flex up or down. The thick reinforced leather provides great pistol support.
High Noon's belt measurement guide was spot on. It indicated I need a 35" belt--not available, but the 34" I chose works very well. FOR ME, a 36" would have been too long. Wrangler jeans belt loops make it tough to impossible to accept the double belt thickness where extra length would lay. If it's not in a belt loop, it sticks straight out.
The belt forms to the waist shape easily, but getting the end of the belt through the buckle and then through the brass retainer was work.

. The belt is thick and making the sharp bends needed for buckling wasn't easily done. After buckling and unbuckling it several times, it started to get a little easier as the belt end started to allow a little more more flex.
I found a belt position and holster cant on my waist where the pistol has good access for draw and is still very comfortable over the several hours I wore it.
I did the whole test, sitting, standing, squatting, touching my toes

, walking around the block when I went to the mailbox and a VERY little jogging. The belt and pistol didn't budge. The pistol stayed where I put it. NICE!
Like any leather, a break-in period should form it to my svelte :-) waist.
I'm pleased. I'm glad I bought it. I'll wear it a lot with and without the pistol. OH, it also looks great.
Hope this made sense.