Your response is certainly fair. I just think it's kind of unfortunate that the competition between JS frameworks has heated up so much of late - I've seen a few potshots aimed at particular frameworks in the last year. I'm tempted to wish that devs/maintainers would evolve their frameworks to occupy distinct, separate niches so they wouldn't have to clash head-on, but that's pretty utopian. (Not that such competition hasn't been happening in technology and business from the very beginning.)

Misko Hevery wrote a bit about dirty checking in Angular on this StackOverflow page linked from the submission: http://stackoverflow.com/questions/9682092/databinding-in-an... I think I've also seen a speed comparison/test involving Angular updating (animating) many objects repeatedly. So I'm not sure how much of an issue dirty-checking is in practice.

I'd like to see civil discussion between maintainers of JS MVC frameworks on technical points, but the higher profile the forum, the higher the stakes and the more mindshare there is to gain/lose. In which case I doubt civility would endure. Still, it's better that people hear the cases laid out side-by-side for each framework, which supplements the reviews given by independent bloggers.