We use commercial and open source software in my animation studio, money is not a huge problem if it helps to deliver a project on time. I'm the boss, I pick the software we buy, and the animators choose what they want to use. Blender is so fast for rigging and animation. Animation is a blast to do in Blender. Fast posing, no gimbal locks, fast keyframe repositioning, etc. Blender renders faster in Linux than in Windows, and is very stable. Something I can't say for other programs.
We just delivered 15 minutes of animation for a recent Guns N' Roses concert in Las Vegas. We're talking a lot of frames, at full HD resolution. As part of the videos. the band singer asked if we could please create and animate a white, hairy wolf, and we did it in two days (that was our time limit).
I have to aknowledge its akward interface. Even with the 2.5 tweaks it feels strange. I think this is the only major feature you can say may alienate new users.