I have quite a bit of Sitka. i am being honest when I say it is worth it for me and my style of hunting. But I have picked my pieces carefully. I hunt primarily public land in Mn, and I have some good spots but i have to hoof it in a ways, crossing creeks and such.
For me, to be able to keep the bulk down is really important for the pack and hunt style, and my Sitka pieces have allowed me to hunt in -17 degrees and still be able to draw my bow back without having the string hit my forearm or cut out early. This is primarily the Kelvin, Fanatic, and Incinerator pieces.
The other must have is the 90% pants or something similar like the Core4element Element pants, IF your in an area with a lot of briars and seeds that stick to you while you walk. I hunt some crap where fleece and most other fabric would pick up so much, that I will be picking it off for hours.
Just my thoughts but if I had short walks and not real cold weather, then I would not think that it would be worth the price because you could find other stuff that is still functional for less.