Ive found that the bigger necks help train your left hand quicker. When i got my Rocket Roll RR50 my hand was killing me after 15 minutes because the neck is so big, after a few weeks it eased off and when i jumped over to my Wizard neck it was incredibly effortless to use.Ironically, in my advancing age, I'm thinking about fatter necks to match my similarly shaped waistlineand also to see if it helps my hands not get so tired when playing for a while.