The boss is a great all around do it all kind of boot! Flex range varying from 100-110 makes it very versatile. It's not the lightest boot I've had, but considering the shock pads in the heel (heavier than my FT classics, and definitely more durable) it seems about right for it. Heel retention is good and it fits me nicely, and my foot really isn't that wide, but I got fitted for it so they feel great!
Great for All-Mountain and park. I live in Illinois and I ski a lot of park and the boot is soft and comfy. I also go out west about 10 days a year and do a lot of freeriding and hiking. If you leave it in the "walk"mode (softer flex basically) but if you put it in the "ski" (nob located in back of the boot) mode it means you're looking for a stiffer flex and you don't want to fuck around.
Overall its a great boot and I would recommend it to anyone with a similar foot style and ski style as me