I have not used a Hydrohut. I considered buying one but I pretty much build one for my first grow.

Mine is smaller in height, but its pretty much the same principle.

I would say Build one. It was really easy and fun.

Benefits are as u listed. No light in. no smell out. :}
So, for me, it was a sealed room in a room in a closet hehe

I feel like im plugging my grow log :P
But check the link in my sig if u already havent.