Where to start on the Billy Goat....
Hands down the most durable ski I have been on in awhile, not only has it been the first ski that has lasted me more than two seasons (past skis have become twisted, delamed, and lifeless), but it's also the first ski to handle everything I've thrown at it without hesitation.
In terms of Durability, ON3P has their stuff dialled down. I consider myself an aggressive skier, someone who is hard on their gear. That being said, skis are usually the first to take a bashing when I enter technical terrain.
The bases of the BGs have withstanded rockfaces, tree stumps, and shark fins, usually with minimal damage. For the two seasons I was on them, only two core shots appeared (both cases were times where I knew it was going to destroy the bases).
The life of the ski stayed consistent throughout the years I skied on it. Always responsive, always stable.
The design of the ski is an interesting one.
It's pintail shape allowed it to float and charge with ease, and doesn't have the rider fall into the backseat.
The ski also uses ON3P's Reverse Elliptical Sidecut, which (if I understand correctly,) gives the ski a turning profile that minimises tip hooking and catching in soft snow. This is a feature I loved about the ski, it gave me full confidence to mach out long GS turns at high speed; without the fear of catching myself and dying like a speed skier.
Finally, The ski has significant rocker in the nose, minimal camber, and slight tail rocker. This allows the ski to charge and/or float through powder at ease, and still be responsive.
This ski is a go to ski for the people looking for a big mountain freeride ski. Beefy waist and rocker profile handles the deepest days, still flex and aggressive stance allowed the rider to blast through any type of terrain from steep straight lines, to choppy crud. The ski is still light enough to serve itself as a very impressive touring ski (got about 30 days of touring on it, and am currently looking for some cheap tech bindings to make it my designated touring ski for the season).
I honestly can't think of a negative thing about this ski. The tail isn't a true twin tip, but that shouldn't prevent you from playing around on the mountain.