My couple of cents is Owning XT Live, then HD500, then 500x and now Helix, its tricky to get the full picture from sound samples (except for the Cabs/IRS which are huge improvement) but i find it really in the feel while playing, its so much more immersive.I play straight to FOH and use IEMS and compared to the 500x i completely forget I am using a modeller when playing. :)