Cutting width is 340mm.
Don't be daft, this is an excuse to buy a power tool i haven't got yet. ;)
Better off buying a mitre box for £5-£10 if that's all you want it for.
How good is this for cutting small things like the trim that goes along side laminate flooring?
Probably not 'better' at cutting wood, I have the 110v orange version (1600w) and the slower blade speed (necessary to cut metal) means it will take fractionally longer to cut wood. If you are a full on carpenter by trade you're not going to be looking at circa £100 saws and will probably splurge on a £600+ Festool. My 255mm saw wasn't set up correctly out of the box, but at least it can be adjusted unlike some cheaper saws.