Dyneema compared to polyester is much more thinner and als the stretch is much more lower. If you are flying stuntkites this is an advantage because your steering commands will be sent much more direct to the kite. You can use this line also for single line kites at ultra light wind.
The Sportsman will challenge the pilot right at the start. It can fly tight loops and corners and is reacting very direct to you steering impulses. If there is enough wind the Sportsman will speed up and gives you a good pull.