Since I live in snow country, I'll comment... the bars on the roof are meant to stop the snow from sliding off. On my big shop, metal roof, 50x96, with 16' side walls, when we get heavy snow fall, the snow on the roof can build up to be a foot or more deep. When it starts to warm in the sun in spring, the steel heats up, and that snow will slowly creep down and slide off... it will also form a layer of ice between the roof and the snow, so it gets very heavy. Falling from 16', it makes a very loud noise when it hits the ground. You do not want to be in that area when it's warming and sliding off in chunks. So those snow stops are very important to have over man-door areas so you don't get hit with snow.
Additionally, you want the gutters to be low enough that if that snow does slide off that it won't take off the gutter.
From what I can see from my experiences with gutters, these guys know what they are doing.