mr.alcheng- do you use pac or awsc for your remote controls? i suppose if you have the awsc working on your pioneer, this would be a quick setup for your new kenwood.
that's about the only good that axxess has imho. i use it on my Fit to do the steering controls on my 2500BT.
if i change to a kenwood HU later with nav or something, i think the only thing i need to do is power the axxess on and it will work with the new HU from another brand.