MCN damn near put me off buying my xtr,(old reviews also rubbished my 1990 suz vx800 which was a magic machine)....I'll leave our technical gurus to talk you through the details of squeezing the last ounce of performance outa these things but..mine's totally stock,will hold 80+ all day,,sips petrol,,and,,,no bad day can wipe the grin off my face when I've been out for a ride,,,done 250 miles a day 2 days on the trot and no niggles about comfort whatsoever,,,can't speak for everyone but I'm seriously hooked on mine..