Thanks for the fast answers!

Another cause of the price difference is one is a toy, the other is a serious piece of equipment used by trained circus performers and acrobats.
You can't really do anything "better", skips are just designed to take more of a beating, the only thing "better" you can do on them is it is easier to jump higher because of the better springs, it requires less effort.
But it would be possible to make flips, backflips and jump over cars when you got enough experience with the poweriser? So no Powerskips are needed?
Coprrect, poweriSer are the original korean copy of PowerSkips, and poweriZer are a chinese copy and are made by a company called flyinglocust who also make FlyJumper, ProJumper, etc (the list is in my sig)
At your weight you would need poweriZer M90's, possibly even M100's...
7League boots are known as 7meilenstiefel pro in Germany. This is their site:
http://www.poweriser.at/technik-gleitlager.htmAnd what if I want to have the PoweriSer model? the PR7090?
Why is it better to buy a model which is over your weight?
Can you say that the quality from the Powerskippers is better than the quality from the powerisers which are better than the powerizers?
I'd prefer the copy from the original model and not the copy from the copy
