Now this is only my experience, however, unless you are going to throw yourself down the Black Run at Glentress don't bother with suspension. As stated earlier they are just dead weight without any benefit.
I have ridden my Giant Escape 1 for about three years on many different terrains and has never let me down. For a wee bity oomph I am now owner of a Liv Invite1, a very different beast, for me any way.
Just a pointer, the higher the Giant model number, the lesser quality of component. These can be upgraded as I did when they wear out.