I'd actually love to have a set of them, and I'd use them... but not as wrenches. Adjustable wrenches **** as wrenches.
The DO, however, make absolutely fantastic flanging tools for sheet metal fabrication. Small bites along the length of the edge, and it'll put a nice flange on it.
And because the bites are small, you can stretch the flange over a radius.
I use straight-handled adjustables for that, but I'd like the leverage and control those curved handles would give.
I've just never found any curved handle adjustables for a price I'm happy with.
$25 is too steep for me.
-Brad