I've run a K1200 for over a year with a re-flashed ECU by Rexxer it runs really well and no piggy back to fit or set up.

Where you'll find things changing when more folk get into re-flashing you just supply your spec ie exhaust and filter set up and they supply you the correct tune with allsorts of mods like being able to disable the lamba in the map and just leave it connected

When I first enquired about such the quote I had was 'PC's will be dead within 3 years' which at the time with two bikes with PC's I took exception I'm not sure about 3 years but their definitley on slippery slope.