The W6 is about 9 years old. The 8W6 and 15W6 were phased out years ago. The W3 uses knowledge gained from W6 and other woofers to be more reliable/better sounding. The W6V2 will ship soon and it has a cast basket and some W7 technology. We have not sold them for 2-3 years because the W3 (which comes in three different ohm loads) replaced the W6.
Look at it this way, would you buy a 1993 vette or a 2002 vette?