Well,
I saw Push 2 days ago, and Knowing last night (neither on blu-ray though).
I'll echo some of the thoughts/predictions here regarding the movies themselves...
Push was entertaining...but it wasn't a "good" movies in terms of plot. For me, Push ranked on par with Wanted. Watchable one time...entertaining...but forgettable.
Knowing was....well....I watched it...and kinda feel like I wasted my time. I've never been a fan of Cage's acting, and it certainly isn't any better in this movie. There are some ridiculously dumb lines in the movie - some that really don't seem to fit but are just thrown in anyway. And the ending was terrible. All in all, I wouldn't watch it again, wouldn't recommend it to anyone either.