The brush is a standard small spiral bristle brush. It has a slight curve in the middle, but nothing particularly noticeable. The formula is very stringy, which I presume is designed to build length.
Its quite a 'wet' mascara and I do get the feeling that as the mascara dries out it will get better.
'Peep show' really does what it says on the tin, it really does build length amazingly. For the way I like my lashes though I do usually need to apply a thinker mascara over the top because it doesn't give the best volume, however like I said I think it will with time.
It doesn't wear off or flake through out the day at all. For the price it was a really good buy, especially suited for someone who has alot of lashes but wants to build length.