Well I tried this tweak out and I gotta say I don't really like it. It's not really like Multifl0w in the way it handles how many pages you have open in it's size. With Multifl0w the size of running apps adjust to the screen depending on how many apps you have open.
With this tweak, even if you have one web page open it only shows that one page really small in the corner instead of adjusting it's sizes to screen likeThe Multifl0w expose cards do.
So that alone really makes it not worth $1.50 to me.
I just purchased this. It is very useful and works well for me. It's not like I'm going to have 5 or six tabs open on any given basis, (I'm using an iPhone 4, not a tablet - this would be more idea for a iPad) but if you have two or three tabs open, this is a great little tweak.