Nate,
The headwaters look like a really solid wader with all of the benefits of Gore-Tex. The one downside when compared with the G3 is the reinforcement of the knees. IMO, where the G3’s really shine is the reinforcement of the knee such that the seem is in the front of the wader and avoids rubbing of the seem on the inside of the leg. This is the area of highest wear and is where most waders will wear out (leak) first. Whether or not that (and the other added features) are worth the extra $130 is totally up to you. Personally, I have the G3’s and absolutely love them. Best wader I’ve ever owned, and absolutely bomb-proof so far (not a ton of time on them, but I would guess about 35 days or so).
Not sure if that helps, but I hope so.
Cheers,
Tim