I'm 6'0" and ~205lbs. and wear a US size 12 boot. My first Custom X was an '09 164W. My current is an '11 162W. Both are paired with same year Cartel EST bindings. I really couldn't tell the difference the 2cm made between the two, but the CX is a badass carver / bomber. It's my go-to board. I've ripped it everywhere from NE ice, Summit County resorts in CO, Pacific NW mashed potato snow, to B.C. groomers.
If you dial in all the setback possible (~2.5" maybe?) it's "ok" in dense or shallow pow conditions. The stiffness and camber profile mean you'll still have to weight your back leg significantly to get through the deep stuff without the nose diving under. I used it for everything until I got a powder deck. Now I only use it 80% of the time...