Right now I have some pretty cheap tecnica all mountain boots. They're pretty comfortable and fit me well, but I might have some extra money to invest a park specific boot. Will I notice a significant difference in lightness or other performance gains? Or is it not worth it if I'm already satisfied in terms of comfort?
you'll notice shock absorption (maybe) and probably some different colors. boots that fit are way better than park boots that don't fit as well. but if park boots fit you and you like them, go for it. I just got il moro's and skied them today and my god, why would anyone ski with boots that don't fit them well.
maybe. but what you will definitely notice is the fit when doing that. my old boots (also techincas) weren't exactly tight on my feet all around, only in some spots. so when I did stuff like that, I felt the skis move without it and it felt heavy. now that i have new boots that fit really well, it's like a billion times more control and i'm not sure if it's lighter (it probably is by a little) but it feels like a huge difference.
Alright I'll probably stick with my current boots for a little longer because I like the way they fit and I'm kind of scared of getting a less comfortable boot for a small difference in performance... During the summer I might start looking for a pair. :)