Actually you ought to be comparing the PM 4224 (not a 3520) to the AB in terms of specs -- when I checked recently, there was relatively little difference in price (less than $1000 difference depending on options chosen for the AB). Having owned a 3520B, there would be no choice (and wasn't -- I replaced the PM with an AB). I used a Sweet 16 for a weeklong class at Arrowmont -- very nice but I much prefer a sliding headstock, so I went AB. I previously had a Jet 1642 for years and preferred it to the PM. I still have the 1642.