I did not find the B2 as unpredictable and unfocused on a turn as GrizzlyMike did. I actuallly liked its turnability, finding it much like a Salomon in that it is very rhythmic -- I can quickly go from tight turns to bigger turns and back and the ski does what I want it to do without complaint. I think the Bandit series is a very fun ski, easy to turn, forgiving, and very versatile. But if you are a former racer, a heavyweight, a top expert, it is probably too soft and forgiving for you. But, I think this points to the market that Rossi is trying to reach with the Bandit line, that being 80% of the skiers out there. Hence you have many on this forum who love Atomic, Volkls, Fishcer, and Head and talk smack about the softer skis of Salomon, Rossi, and sometimes Dynastar and others.
On the B2 vs the B3 -- I thought the B3 is was the better ski of the two. It's about as quick and the extra width helped me in bad snow. As far as groomers/trails vs. off-piste, I think the B3 is so versatile it will not matter -- it would make a great everyday ski. A friend says a very good skier he knows has been able to ski the B3 a bunch this spring (he bought it somehow) and LOVES it. He used it at Mammoth in all kinds of conditions. A dealer (who has three guys on the B3 the last two months) is predicting the B3 (or maybe the B2) will be the "ski of the year" next season. While that doesn't always mean something, I think the piont is that many, many people are going to love the new and improved Bandit line.
For me, it is between the Dynastar Legend 8000, the B3, and the one I have yet to demo, the Volkl AC4. I want an all-mountain, all-conditions ski (or as close to that as I can get) that has a big sweet spot and will do well in crud.