These were originally called the Alaskan saw mill and are popular here. They will burn through chains very fast so be prepared to sharpen often and they will burn out a wimpy engine so bigger is better.

A little bit of a 'trick" I learned for those of us who grow Coleus plants/bushes.
At the end of Summer-early Autumn, trim the plant/s back to approx. half their size and diameter, leaving just a few small shoots and a few leaves, then cover the plant/s with either a clear plastic shroud open at the top OR , if they're in pots put a large clear plastic, at least 2 litres in capacity, with the base cut off over them, embed the shroud or bottle into the surrounding soil and water sparingly over the colder months.
Watch them as they re-generate and when Spring is in full swing again remove the covers.
Instead of them just dying off, you will have fresher, more bushier Coleus plants again.

I'd love to have one of those, we get a tree out here we call either 'Black Oak' or 'Blood-wood Oak', the timber from it is the colour of blood when it cut from from still growing tree and when from an already dead tree it is very much like the colour of dried blood.
I reckon furniture, shelving, etc, made from that timber and either just oiled or clear varnished would like really great.

My ex has a huge one of these for slabbing redwood

Fine if you want to produce rough lumber or dice and slice cadavers to envelope fore posting.
What do you intend using it for and why couldn't you borrow your neighbours?

Whoa, that looks like some serious equipment!

That looks way cool, and I'd stay as far away from it as possible. You go have fun.