Yeah, I'd like one out of lighter material...I was concerned aluminum wouldn't hold up too long (this stove is a bit labor-intensive to build, especially out of steel).
Maybe I'll splurge for titanium if I find I use it a lot.
As for wind, I think it would be an issue. The stove is a very open design.
As far as other metals, just make sure they're not galvanized- they'll emit toxic fumes when burning.
I don't think this is necessarily the "best", fastest, lightest, or most efficient wood stove out there. However, I can really see myself using it on mellow solo trips as a fireplace (so I don't scar the ground/have to create a fire pit). In that regard, it might be better than some other stoves. It's fun to use, creates plenty of warmth and light for one or two people.