Powerisers are made in korea. Powerstriders are made in china. Powerisers have different springs, I think they are stiffer than the powerstriders. The powerisers have been having some problems with the frame warping but that might be fixed by now. I think powerstriders are probably a bit ahead of the powerisers atm. They now come with the upgraded bindings and calf cuffs and stuff. They are the same as projumps. Sprog will know more about this ![Cheesy :D](http://www.projumpforum.co.uk/Smileys/default/cheesy.gif)
Korea (but actually assembled in the phillipines) = HiTech & C, Co.
China = FlyingLocust/FlyJumper (Same company, seems to operate under 2 different names for some reason)
The Poweriser frame warping problem was fixed a while back Spud, they made a few changes to the construction and it sorted it out. Poweriser springs are fibreglass only, PowerStrider are a fibreglass/carbonfibre composite. Personally I'd say they're about equal in terms of build quality and lifetime. Other than that you're all cool Spud
![Tongue :P](http://www.projumpforum.co.uk/Smileys/default/tongue.gif)
AirTrekkers are the same as ProJump/PowerStrider/FlyingLocust/FlyJumper/etc/etc
AirTrekker as a company are regarded as a bit of a joke in the community as they attempted to rename the entire sport of PowerBocking to "AirTrekking" last year, under the argument "Skateboarding isn't named after the inventor - so why should this sport be either? Skateboarding you skate on a board, in this sport you Trek the Air - AIRTREKKING!". They pretty much realised their mistake after the massive community backlash against them
![:Claugh:](http://www.projumpforum.co.uk/Smileys/default/Claugh.gif)
I can't remember anyone purchasing off them recently though, so I'd go with either of the two companies I linked to earlier.