My Russell custom fit boots are perfectly comfortable, and I'm sure will last just fine.
That said...
They're not just a small percentage higher in cost than Crispi's or other quality boots.  South 40 Birdshooters, not custom fit, just off the shelf, are $1065 now.  Gustin Birdshooter for $900+
They tout the 'triple vamp' construction as being nearly waterproof, and no need for goretex or other waterproof linings.  I don't think my feet would be any wetter if I were wearing flipflops in a good wet grass, even after treating with Obenauf's.
On my 'custom' boots I ordered, where the customization was only my foot measurements, they didn't even get the sole correct, they put an optional sole on them from what I ordered.  That's fine, they're comfortable, they seem to be durable, but you'd think for the price they'd have at least got that basic thing right.