The question is backwards: What advantage do headed basses have over headles? A headless design eliminates most of the disadvantages of traditional design, not the other way around. The body can be relatively light because it doesn't have to offset weight of tuners and headstock at the end of a long lever. Straight pull tuners are inarguably superior to any traditional tuner system. My Steinberger will stay in tune for MONTHS, and its impervious to temp or humidity changes. I'm sure it's possible for a graphite CF neck to have deadspots, but ive never played a Steinberger that had any, and never played a wood one that didnt. I don't get the knock on double ball strings, I've had ONE break in 35 years, and I've never had any trouble getting the gauges I like online.