Welcome @flooded and thanks for the great intro. How do you feel the IH jeans compare to the ONI/PBJ jeans? I'm always amazed at how a straightforward design (the five pocket jean) can be expressed in so many ways and how these brands manage to imprint their aesthetic on every product they make.
Thanks.
In terms of construction quality, I think Iron Heart are as good as jeans get. I also like the 666 cut more than pretty much any other pair of jeans I own.
I like interesting things done with denim, and only own 2 pairs of indigo warp/white weft jeans. I have a pair of grand indigo dyed Flat Head, made out of their 16 ounce denim which fades with FH's signature vertical lines. My other pair of blue/white jeans are a pair of PBJ KS-013, which until my recent weight loss were a little tight, so haven't seen a lot of wear. All my other pairs of jeans are (among others) double indigo, indigo/black, indigo/purple, kakishibu/indigo, and of course indigo overdyed black. While I still love and wear super slubby, unsanforized denim for the incredible fades it produces, I've found that it tends to wear through much quicker due to it's rough character, and is nowhere near as resilient as the IH's.
The first 3 pics below are of the Flat Head 'Last Corl' after around 8 months of wear with a couple of soaks and 2 machine washes. You can see the vertical fading I mentioned. The last 2 pics are a pair of Oni 516-IDID after around 6 months of wear with 2 soaks. As you can see the denim is incredibly rough, producing some interesting fades, but also, starting to wear through where the corner of the phone sticks out.