I'm about to purchase a brand spanking new MIA Jazz. I was considering swapping out the pickups straight away for some NJ4SE's, but is it really worth it? I mean, is there anything wrong with the stock pickups apart from the SC hum. This was the main reason I was considering swapping, but realised I'll probably always run both pickups together anyway. Are there any other issues with the stock pickups I should know about?