An odd question for a Tech site I know but this place is a treasure house of information.

I have to get a Wheelchair ramp installed at the rear of my home, this is an area that during the winter does not get much sun and I have been advised that for safety reason
I should not get a wooden or concrete  construction.

Has anyone had experience with Aluminium ramps?

There is a company Able Axcess Ltd that makes aluminium ramps has anyone had any experience with these guys? (see link below)

Any advice would be gratefully accepted. 

http://www.ableaxcess.co.nz/able%20axcess%20website_007.htm

The ramp would look similar to this