Can't help you with the B1s, but I have been skiing on the B2's in a 176cm for the last 2 seasons (120^ days). Here's my thoughts on the B2's if you're interested, them being a kinda similar construction to the B1's:
I'm 6'3'' but not as heavy: about 175lb, and I think the B2 (and maybe the B1) is is suited for a lighter skier than other similar skis from other Brands. They have a very soft flex tip to tail like a park ski, and felt a little harder tortionally.
They felt great for cruising around the mountain, a small amount of powder (they float really nicely if you are a light enough weight), moguls, jumps, and fall-line short turns (you can recover if you get caught back due to the soft tail).
Things I didn't like: They feel great doing med-long turns at med speeds but when I got going fast they didn't feel as stable, and had a lack of strong edge hold. When the powder got chopped up I felt like I could go over-the-handel-bars at any moment, and did a few times. They are a light ski and didn't want to power through the chop, instead they got bashed around by snow chunks. I felt like I needed the 182cm for stability.
Overall, i'd say the B2 (and B1) are great all purpose ski for a cruisy intermediate-advanced skier, but if you're going to get going fast, go for something a bit stiffer.