Mate, Im with you on that.
Ive noticed a difference in my MK3 GTi and yes, it certainly puts a bit more Ooomph into the mid-range.
Ive been using it for over a year now. Its alot more pricey than conventional super unleaded, but worth it, dont you think.
Regards
p.s If youre gonna use it in the long run, and frequently, start collecting the points too. I do.